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<?php
  
add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'walking_mobility' == $params['facet_name'] ) {
        if ( "No" == $params['facet_display_value'] ) {
          $params['facet_value'] = ''; // skip indexing
        } elseif ( "Yes" == $params['facet_display_value'] ) {
          $params['facet_display_value'] = 'Walking Mobility';
        }
    }
    return $params;
}, 10, 2 );