One of the Heroic devs is working on project Xodus, which is aiming to make game pass and other windows store games work on Linux/steam deck. They already have Xbox logins, license checks, and game downloads working, but are still working on the games themselves.
An important note:
That being said, the Xodus project is targeting games using Microsoft’s newer GDK and MSIXVC format. Older apps that use the UWP format, such as many games released during the Windows 8 and early Windows 10 period (Forza Horizon 3, Gears of War 4), aren’t planned to be supported.
to be honest i dont care about game passes, i prefer to buy my games on gog so i can have them drm free. But this is indeed a cool thing. A lot of people still dualboot for these xbox gamepass things.