With this you can intervene in the sent fields via the feedback form. You can also add your own fields, which will then be saved in the database.

$fields: name, email
$session: Everything that is actually stored in a session can be found in this optional variable.

/**
 * This can be used to edit sent fields.
 *
 * @param array $fields submitted fields.
 * @param array $session submitted session data.
 *
 * @return array
 */
function custom_function( $fields, $session ) {
	return $fields;
}

add_filter( 'helpful_feedback_submit_fields', 'custom_function', 10, 2 );

Source code:

class-helpful-helper-feedback.php#L128