How can to restrict SPECIFIC CMS pages from being seen by non-logged-in customers?

Need to block some CMS pages from the non-logged-in customers
Using an observer and Events

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="controller_action_predispatch_cms_page_view">
        <observer name="add_login_checker" instance="<vendor>\<plugin>\Observer\RestrictCmsPage"/>
    </event>
</config>

<?php

namespace <vendor>\<plugin>\Observer;

use Magento\Customer\Model\Session as CustomerSession;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;

class RestrictCmsPage implements ObserverInterface
{
    
    protected $_actionFlag;
    
    protected $_cmsPage;

    public function __construct(
        CustomerSession $customerSession,
        \Magento\Framework\App\ActionFlag $actionFlag,
        \Magento\Cms\Model\Page $cmsPage,
        \Magento\Framework\App\Response\RedirectInterface $redirect
    ) {
        $this->customerSession = $customerSession;
        $this->_actionFlag = $actionFlag;
        $this->_cmsPage = $cmsPage;
        $this->redirect = $redirect;
    }
    public function execute(Observer $observer)
    {
        if($this->_cmsPage->getIdentifier() == "your_identifier_name"){
            if (!$this->customerSession->authenticate()) {
                $this->_actionFlag->set('', \Magento\Framework\App\Action\Action::FLAG_NO_DISPATCH, true);
                if (!$this->customerSession->getBeforeUrl()) {
                    $this->customerSession->setBeforeUrl($this->redirect->getRefererUrl());
                }
            }
        }
        return  $this;
    }
}

Getting the page ID or page identifier

Using Object manager

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$cmsPage = $objectManager->get('\Magento\Cms\Model\Page');

echo $cmsPage->getIdentifier(); //Get Current CMS Page Identifier
echo $cmsPage->getId(); //Get Current CMS Page ID


using the Factory method

protected $_cmsPage;

public function __construct(
    ...
    \Magento\Cms\Model\Page $cmsPage,
    ...
) {
    ...
    $this->_cmsPage = $cmsPage;
    ...
}

echo $this->_cmsPage->getIdentifier(); //Get Current CMS Page Identifier
echo $this->_cmsPage->getId(); //Get Current CMS Page ID