FacetWP - sort options to include multiple fields

functions.php

<?php

add_filter( 'facetwp_sort_options', function( $options, $params ) {
    $options['points_desc'] = [
        'label' => 'Points (Highest)',
        'query_args' => [
            'orderby' => [ 'date' => 'ASC', 'meta_value_num' => 'DESC' ],
            'meta_key' => 'points'
        ]
    ];
    return $options;
}, 10, 2 );