Lutris would also work if you set GE-Proton on it too. From its hamburger menu, go to Preferences, go to Runners tab, find Wine way below the list, open its settings (left button), and select GE-Proton as your Wine version. It will detect if you put it one on Steam's /compatibilitytools.d/ directory, or you can manually select your preferred directory by enabling advanced options too.

If it works on Heroic, you don't need to do this of course. I just wanted to let you know that it's possible on Lutris too. I think Lutris needs a built-in GE-Proton downloader just like Heroic.