Receive data from Push notifications on tvOS

Question

I tried to get some data from a push notification on tvOS.

Sent a message via Firebase and received it using this function:

extension AppDelegate: UNUserNotificationCenterDelegate {
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        let content = notification.request.content
    
        // API_UNAVAILABLE(tvos)
        // let userInfo = content.userInfo
        // let title = content.title
        // let subtitle = content.subtitle
    
        completionHandler([[.alert, .sound]])
    }
}

Using userInfo, title, or subtitle as on iOS is not possible.

If we look at the UNNotificationContent interface, we see that there are many restrictions on access to content parameters (API_UNAVAILABLE(tvos)).

I printed the UNNotificationContent object in the Xcode console. And I found that the title and message text are on this object.

Is it possible to pass some useful information to Push message and parse it?