Not sure this was posted already, but it seems you can
buy EGS games in GoG Galaxy 2.0. While this may sound like a good idea, I'm not sure it is. After all, you're still buying the games from Epic, not from GoG. For me, this is just more proof that Epic's end goal is to get full control of games distribution, and that exclusives are the key to achieve this.
Edit: you still need the EGS launcher to download these games. It also seems these games aren't (always) DRM-free:
"No, the launcher is still necessary as these games have DRM. It means that, if you already have the Epic launcher installed, you can install the game without leaving the GOG GALAXY app. Otherwise when you were to install the game, it will ask you to install the launcher."