add column to show number of user accounts that have favorited each post (the default 'post' post type) see screenshot in comment below code for end result.

code.php

<?php

// Add a custom column to display favorite count of each post
add_filter('manage_post_posts_columns', 'add_favorited_users_column');
function add_favorited_users_column($columns) {
	
    $columns['favorited_users'] = 'Favorited Count';
    return $columns;
}


// Display the count in our custom column
add_action('manage_post_posts_custom_column', 'show_favorited_users_column_content', 10, 2);
function show_favorited_users_column_content($column, $post_id) {
	
    if ( $column == 'favorited_users' ) {
        echo bricksextras_post_favorite_count( $post_id );
    }
}


// Optional / make column sortable
add_filter('manage_edit-post_sortable_columns', 'register_favorited_users_sortable_column');
function register_favorited_users_sortable_column($sortable_columns) {
    $sortable_columns['favorited_users'] = 'favorited_users';
    return $sortable_columns;
}

// Modify query to sort by the "Favorited Count" column - the x_favorite_users_count
add_action('pre_get_posts', 'sort_by_favorited_users_column');
function sort_by_favorited_users_column($query) {
    if (!is_admin() || !$query->is_main_query()) {
        return;
    }

    // Check if we're sorting by the "Favorited Count" column
    if ($query->get('orderby') === 'favorited_users') {
        // Get the current order direction
        $order = strtoupper($query->get('order')) === 'ASC' ? 'ASC' : 'DESC';
        
        // Set a meta query
        $query->set('meta_query', array(
            'favorite_count_clause' => array(
                'key' => 'x_favorite_users_count',
                'compare' => 'EXISTS',
                'type' => 'NUMERIC',
            ),
            'relation' => 'OR',
            array(
                'key' => 'x_favorite_users_count',
                'compare' => 'NOT EXISTS',
            ),
        ));
        
        // Order by our named clause
        $query->set('orderby', array(
            'favorite_count_clause' => $order,
        ));
    }
}

end result..