Allow to choose audio device or other application when screen sharing

I wanted to screen share a DS game but i use OBS to change the layout of the top and bottom screen, screen sharing OBS does not play audio even if it is passing through the audio to my main playback device

this would not be an issue if you could choose an audio device or different application to get the sound from. e.g stream OBS fullscreen preview and choose the emulator for audio source

Edit: you could add it as another tab when you start screen share
it would then look like "Applications    Screens   Advanced"