How to rearrange the Shipping and Billing Address field on the checkout page?

In JJ\Checkout\Plugin\Checkout\Block\layoutprocessor.php

<?php

namespace JJ\Checkout\Plugin\Checkout\Block;

class LayoutProcessor
{

    /**
     * Position the telephone field after address fields
     *
     * @param \Magento\Checkout\Block\Checkout\LayoutProcessor $subject
     * @param array $jsLayout
     *
     * @return array
     */
    public function afterProcess(
        \Magento\Checkout\Block\Checkout\LayoutProcessor $subject,
        array                                            $jsLayout
    )
    {

//Shipping Address
        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']
        ['children']['shippingAddress']['children']['shipping-address-fieldset']
        ['children']['firstname']['sortOrder'] = 1601;
        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']
        ['children']['shippingAddress']['children']['shipping-address-fieldset']
        ['children']['lastname']['sortOrder'] = 1602;
        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']
        ['children']['shippingAddress']['children']['shipping-address-fieldset']
        ['children']['city']['sortOrder'] = 1606;
        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']
        ['children']['shippingAddress']['children']['shipping-address-fieldset']
        ['children']['region_id']['sortOrder'] = 1607;
        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']
        ['children']['shippingAddress']['children']['shipping-address-fieldset']
        ['children']['postcode']['sortOrder'] = 1604;
        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']
        ['children']['shippingAddress']['children']['shipping-address-fieldset']
        ['children']['telephone']['sortOrder'] = 1603;
        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']
        ['children']['shippingAddress']['children']['shipping-address-fieldset']
        ['children']['street']['sortOrder'] = 1605;
        $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']
        ['children']['shippingAddress']['children']['shipping-address-fieldset']
        ['children']['country_id']['sortOrder'] = 1608;


//Billing Address on payment method
        if (isset($jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
            ['payment']['children']['payments-list']['children']
        )) {
            $paymentList = $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
            ['payment']['children']['payments-list']['children'];

            foreach ($paymentList as $key => $payment) {

                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['payments-list']['children'][$key]['children']['form-fields']['children']
                ['firstname']['sortOrder'] = 1601;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['payments-list']['children'][$key]['children']['form-fields']['children']
                ['lastname']['sortOrder'] = 1602;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['payments-list']['children'][$key]['children']['form-fields']['children']
                ['city']['sortOrder'] = 1606;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['payments-list']['children'][$key]['children']['form-fields']['children']
                ['region_id']['sortOrder'] = 1607;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['payments-list']['children'][$key]['children']['form-fields']['children']
                ['postcode']['sortOrder'] = 1604;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['payments-list']['children'][$key]['children']['form-fields']['children']
                ['country_id'] ['sortOrder'] = 1608;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['payments-list']['children'][$key]['children']['form-fields']['children']
                ['telephone']  ['sortOrder'] = 1603;

                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['payments-list']['children'][$key]['children']['form-fields']['children']
                ['street']['sortOrder'] = 1605

//Billing Address on payment page
            if (isset($jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['afterMethods']['children']
            )) {

                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['afterMethods']['children']['billing-address-form']['children']['form-fields']
                ['children']['firstname']['sortOrder'] = 100;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['afterMethods']['children']['billing-address-form']['children']['form-fields']
                ['children']['lastname']['sortOrder'] = 200;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['afterMethods']['children']['billing-address-form']['children']['form-fields']
                ['children']['city']['sortOrder'] = 600;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['afterMethods']['children']['billing-address-form']['children']['form-fields']
                ['children']['region_id']['sortOrder'] = 700;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['afterMethods']['children']['billing-address-form']['children']['form-fields']
                ['children']['postcode']['sortOrder'] = 400;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['afterMethods']['children']['billing-address-form']['children']['form-fields']
                ['children']['telephone']['sortOrder'] = 300;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['afterMethods']['children']['billing-address-form']['children']['form-fields']
                ['children']['street']['sortOrder'] = 500;
                $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']
                ['payment']['children']['afterMethods']['children']['billing-address-form']['children']['form-fields']
                ['children']['country_id']['sortOrder'] = 800;

            }
            return $jsLayout;
        }
    }

}