public function transform_item_values_to_json( $item ) {
		foreach ( $this->args['fields'] as $field ) {
			$true_field = $this->find_item_key( $item, $field );
			$value      = is_object( $item ) ? $item->$true_field : $item[ $true_field ];
			if ( is_array( $value ) || is_object( $value ) ) {
				if ( is_object( $item ) ) {
					$item->$true_field = json_encode( $value );
				} elseif ( is_array( $item ) ) {
					$item[ $true_field ] = json_encode( $value );
				}
			}
		}
		return $item;
	}