[Firebase Messaging] Get actions when user taps notification banner

[delfme]

We use getInitialMessage() and onMessageOpenedApp to grab the event "user tapped a notification banner" and then navigate user to a screen.

Is there a way to also grab the button tapped by the user in case that actions are attached to the notifications? We need this to manage Accept/Decline of an icoming phone call.
On IOS, we are using ios Notification Service Extension, so we cannot rely on flutter_local_notification and we'd need firebase above methods to being able to get actions selected by the user when tapping the notification banner.

[darshankawar]

@delfme
I think this is not supported by the plugin per #1484 (comment).
I am moving this issue to discussion if anybody else has any other opinion or solution.