facetwp has term

<?php 

add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'my_facet_name' == $params['facet_name'] ) { // change my_facet_name to the name of your facet
        $params['facet_value'] = "1";
        $params['facet_display_value'] = 'Has Term'; // change Has Term to whatever you want for a label
    }
    return $params;
}, 10, 2 );