For your information, Xbox Game Pass just appeared in the middle of 2020, it doesn't require sophisticated smartphone specifications to play these games, because you will immediately stream the game from Microsoft servers.
What do you need?
The first way to play Xbox games on Android smartphones and tablets is to download the Xbox Games Pass application via the Google Play Store. To use it, your cellphone or tablet must have Android 6 Marshmallow and Bluetooth 4.0, which the majority of today's smartphones have.
As previously mentioned, you don't need to worry about the specifications of your phone or tablet, because the weight of the games you play will be borne by Microsoft servers. In essence, if you can download the application, then you will be able to play it.
Xbox Games Pass Ultimate itself can be purchased for US $ 15.
You will also need a controller to connect to your smartphone. Many controllers are compatible with the service. You can see the list at this LINK
The last thing you need is a stable internet connection. Microsoft itself recommends using Wi-Fi with a 5GHz connection and a speed of 10 Mbps. You can play it on a 2.4GHz connection, but game performance will improve significantly on a 5GHz connection.
You are welcome to share your ideas in comments.