Running games installed via Heroic from Terminal possible?

Hi. I connected Heroic to GOG and installed a game which worked fine. Now GOG has outages and starting the game does not work: After clicking the play button, it returns after a few seconds. This kinda defeats the purpose of GOG, namely playing games offline.

So I would like to know if it's possible to run games installed via Heroic directly from the terminal (with Proton) because I guess this would circumvent the starting issue in Heroic.
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