Sort of. It might be a good idea to see what the mentioned Heroic Launcher does. What I do is tedious and cumbersome.

1. Download all gog install files and place them in some folder.
2. Add a non-steam game for the installer executable, with the corresponding working directory
3. Run the “game”, with the proton compatibility mode enabled.
4. After installing, change the entry from 1, to point to the game executable (you’ll have to search for it), and corresponding working directory.

When installing, it is sort of the same story. Download update files. Run the update. Change the entry back.

I’m sure there are better ways to do this. So I’ll probably check the Heroic Launcher. I remember trying similar things in the past, and I wasn’t all that happy with it.