Assist audio source selection

Hello there, I'm new and many thanks for this awesome project. I'd like to contribute by reporting this issue about the long awaited Assist feature.

Yes double checked it, there is no duplicate.

**Is your feature request related to a problem? Please describe.**

There is no audio source selection (microphone) when multiple are present. Assist fails to undersand absolutely all spoken words when the default selected source is processed without mean to change it.

**Describe the solution you'd like**

Add option in companion app parameters to select audio source for example:
- default
- mic
- unprocessed
- voice communication
- voice recognition
- bluetooth
- ...

**Describe alternatives you've considered, if any**

No alternative yet. I'm trying a wonky workaround bypassing companion app but without much success so far. The idea is to tweak the simple voice recorder app (which allows to select the audio source) to stream audio to ha server..

**Additional context**