You can add the GOG executable to steam as an external game and run it through Proton that way. Bit of an odd setup I suppose, but it ought to work.

I didn't even get it to launch by doing this. but I am a newb to this kind of thing. I am hoping the direct DL from GOG instead of from gog galaxy will work better for me and run proton in lutris with it.

I tried to run Innoextract on the 'Launch Cyberpunk 2077.ink' but I couldn't get it to work either.

I kinda got it working, ish; I ran:

     innoextract --gog setup_cyberpunk_2077_build_3214677change_4155897_\(64bit\)_\(43299\).exe --language en-US

then added bin/x64/Cyberpunk2077.exe to Steam, then got it to start with Proton-5.21-GE-1. It looks like there's a big performance hit w/ nvidia-drivers 455.28-r1, though, and it's pretty crashy (~1 crash / 15 minutes until I gave up).

No it crashes constantly for me. Created my character and now the game won’t load. Resinstalled and it still doesn’t work.