Whether vorpX can hook into Game Pass games largely depends on whether they are ‘normal’ Win32 applications or UWP (Universal Windows Platform) apps. The latter category of apps was introduced by MS a few years ago for their store. UWP apps run in a sandbox and can’t be hooked. Many first party Microsoft games on Game Pass are UWP, most third party games aren’t.
Luckily there is some hope that in the future less and less games will be UWP apps. Apparently the Windows store as well as UWP wasn’t exactly the success MS had hoped for. Fingers crossed.