[firebase_messaging] To show HTML content in notification

[snj07]

I don't see any option to show HTML content in the notification title or body. I

Describe the solution you'd like
The plugin should be able to extract the data key without considering notification key if it does not have any title or body and it should show the HTML content directly in the push notification.

Additional context
It works very well in Ionic plugin you can check the code here