add_filter( 'rest_record_query', 'filter_records_by_source_field', 999, 2 );
function filter_records_by_source_field( $args, $request ) {
  $filter_params = ['test'];
  $active_params = [];

  foreach ( $filter_params as $filter_param ) {
      if ( isset( $request[$filter_param] ) ) {
          $active_params[] = $filter_param;
      }
  }

  if ( count( $active_params ) === 0 ) {
    return $args;
  }

  $meta_query = array();

  if ( isset( $args['meta_query'] ) ) {
    $meta_query = $args['meta_query'];
  }

  $meta_query['relation'] = 'AND';

  foreach ( $active_params as $param ) {
    $meta_query[] = array(
      'key' => $param,
      'value' => sanitize_text_field( $request[$param] )
    );
  }

  $args['meta_query'] = $meta_query;

  return $args;
}