@Takanami Several Stadia games support local multiplayer:
So yes, you should be able to do local 1v1 in MK11.
This thread has some tips on getting multiple Stadia controllers connected for a local multiplayer session over Chromecast:
yes this is supported, I tried it myself with my BF. I have a founder's controller and bought a second one for him separately. When I am starting MK 11, he can join with his controller and then we are able to play 1vs1 together local (both sitting on the same sofa haha). So yeah, this is working pretty well.
I have not tested other games, but MK 11 and Samurai Shodown were played well with those two controllers.
Hope this helps. 🤗