Android AudioManager Stream / QML Audio roles are not supported on Android

I don't know why this was not already done, but the QML Audio element has "roles" and Android's AudioManager has streams, and they match very nicely:

AudioManager   : QML Audio Role
STREAM_ACCESSIBILITY	:	AccessibilityRole
STREAM_ALARM	:	AlarmRole
STREAM_DTMF	:	**no match**
STREAM_MUSIC	:	[MusicRole, VideoRole, GameRole]
STREAM_NOTIFICATION	:	NotificationRole 
STREAM_RING	:	RingtoneRole
STREAM_SYSTEM	:	SonificationRole
STREAM_VOICE_CALL	:	VoiceCommunicationRole

I looked at the Qt source on gitlab and the https://github.com/qt/qtmultimedia/blob/5.12/src/plugins/android/jar/src/org/qtproject/qt5/android/multimedia/QtAndroidMediaPlayer.java

Makes no mention of streams or roles, and neither does its JNI interface.

The QML Audio docs say: "The audio role must be set before setting the source property." which is annoying but I can deal with it. But on android this doesn't even work.