How to get the associated images line count and images from item record?

var images= [];
var itemrecord = record.load({
                        type: record.Type.INVENTORY_ITEM,
                        id: item,
                        isDynamic: true,
                    });
   var totalLines = itemrecord.getLineCount({
                    sublistId: 'itemimages'
                });
      for (var i = 0; i <= totalLines; i++) {
    

                    var imageName = itemrecord.getSublistValue({
                        sublistId: 'itemimages',
                        fieldId: 'name',
                        line: i
                    });
    
                    images.push(imageName);
   }

Here the type of item record will varies as well as the item record should be parent.