facetwp custom data in json

<?php
/** return custom data in the json facet returns on refresh
 ** access with FWP.settings.my_data in JS
 */
add_filter( 'facetwp_render_output', function( $output, $params ) {
    $output['settings']['my_data'] = 'some data';
    return $output;
}, 10, 2 );