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Well, that is a quandry. Usually when you add a non-Steam Game it goes through a list of apps installed on your PC.
You would have to open "C:\Program Files\WindowsApps", but unfortunately it will deny you permission to do that.
However, from what I am reading, you likely will not be able to do this without messing with that folder's permissions settingfs. That can be a very dnagerous thing to do because if you mess up, you will mess up the system.
One thing to note is that the apps form the Windows Store are not .exe files at all. I cannot rermember the extension, but I do know that it is similar to how Android contains its apps in an .apk file.
That being said, I do not think you can actually do that unless the app is stored in an accessible folder.
*EDIT*
You can't do it anyways because these Xbox Win10 Store Games are developed under UWP (like Sea of Thieves)
Universal Windows Platform (UWP) is an API created by Microsoft and first introduced in Windows 10. The purpose of this platform is to help develop universal apps that run on Windows 10, Windows 10 Mobile, Xbox One and HoloLens without the need to be re-written for each.
So they do not even use EXE files which could be added to Steam as a non-steam game.