Expose permission requests from WebView through QML API

Hi
I can't access camera and microphone under QML WebView on Android platform. I have set permissions in AndroidManifest. It seems that questions regarding WebView goes unanswered in community support. Is this a bug, lack of functionality? Will this be ever corrected or this is some deeper problem and won't be fixed?

Example is set for url: https://webrtc.github.io/samples/src/content/getusermedia/gum/

Best Regards
Marek