Filter calls for post_name as meta data (like a custom field)

WP_filter_get_post_name_as_meta.php

<?php 
/**
* Filters get_post_metadata calls for "post_name" (post slug) which is not part of the meta data. 
* This can be used where dynamic codes allow using a custom-field, useful for setting the ID of an element in a loop
*/

function filter_get_post_name_as_meta( $value, $object_id, $meta_key, $single ) {
    // Only proceed if the meta key is 'post_name' and no value has been returned yet.
    if ( 'post_name' !== $meta_key || null !== $value ) {
        return $value;
    }
    
    $post = get_post( $object_id );
    if ( $post instanceof WP_Post && property_exists( $post, 'post_name' ) ) {
       if ( $single ) {
            return $post->post_name;
        }
        return [ $post->post_name ];
    }
    return $value;
}

// Hooks into the generic post metadata filter.
add_filter( 'get_post_metadata', 'filter_get_post_name_as_meta', 10, 4 );