Adding an Installed Game to GOG (Not a License) (Cyberpunk 2077)

Hello guys, I liked the game, but that's not the point, in short - I have a Gog version, not bought, I want to buy in the EPIK store - there is a coupon right now - 650 rubles, tell me - is it possible to add it to Gog when buying a game in EPIK, and then - add an already installed non-licensed copy to gog?
Thank you in advance.