Is it possible to run GOG Galaxy inside Steam via steam-store application?

I know that on Steam it is possible to run non-steam applications and games via "Add non-steam game", but I’m running Steam via Geforce Now service where this way doesn’t work. You can add non-steam games but you can’t succesfully execute them. I have two questions then:

1. Is it possible to run GOG client as a Steam app (I couldn’t find on Steam Store)?
2. Is it possible to run GOG client using some Steam app available on the store – maybe some kind of file manager or something like that?

I was trying to find some apps to do this but could’t find anything resembling general launcher or file manager. Maybe I was looking in wrong places.