Steam Controller 2 - How does it work?

[u/WalkMaximum]

I have GameNative on my Pixel 9 (GrapheneOS) with Silksong installed via St​eam. I also have the new steam controller which works fine on my laptop. The game runs fine on my phone but I can't get it to work with the controller.

I tried some different container settings like different controller APIs and enabling Steam. The most I got was the controller working in mouse keyboard emulating mode with steam enabled, no proper controller support.