Released yesterday, Cloud Gaming for Xbox Game Pass Beta (aka xCloud) hits Android but Microsoft claims no support for Android TV.
Unsupported doesn't mean it doesn't work :D
This is a video showing you how to harvest the APK off your phone and install it on an Android TV using the X-Plore File Manager and cloud storage.
Xbox Controller w/Bluetooth - https://amzn.to/32wCnXq
NVIDIA ShieldTV (Android TV) - https://amzn.to/2RCVBV8
Xplorer File Manager - https://play.google.com/store/apps/details?id=com.lonelycatgames.Xplore&hl=en_US