Android wireguard all hasn't been updated in 18mo. Its extremely simple with a small code base. There basically isn't anything to update. It uses wireguard kernel module which is itself is only like 700 lines of code. It so simple that it basically became stable very quickly and there is nothing left of update right now.
https://git.zx2c4.com/wireguard-android/about/
I personally get the from obtainium to bypass play store
I haven't tried it, but the app has the ability to select which app it tunnels.
When you make a new tunnel, it says "all applications" if you click on that you can select specific ones to include or exclude