FacetWP - sort by rating

gistfile1.php

<?php

function my_facetwp_sort_options( $options, $params ) {
    $options['rating'] = array(
        'label' => 'Rating',
        'query_args' => array(
            'orderby' => 'meta_value_num', // sort by numerical custom field
            'meta_key' => 'rating', // required when sorting by custom fields
            'order' => 'DESC', // descending order
        )
    );
    return $options;
}
 
add_filter( 'facetwp_sort_options', 'my_facetwp_sort_options', 10, 2 );