FacetWP map facet: Get location from College taxonomy custom location field

facetwp-custom.php

add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'college_map' == $params['facet_name'] ) {
        $term_id = (int) $params['term_id'];
        $location = get_term_meta( $term_id, 'location', true );
        $params['facet_value'] = empty( $location ) ? '' : $location['lat'];
        $params['facet_display_value'] = empty( $location ) ? '' : $location['lng'];
    }
    return $params;
}, 10, 2 );