Ah then what you want is probably umu launcher

Then you can run whatever you want under proton, though this isnt "officially" supported so you might have an odd glitch or 2. But if it runs on steam proton fine enough, it shouldn't be much different

Well, you see, your prior employers made the UNFORGIVABLE sin of treating employees like adults. They'll be out of business here in 2 seconds because their employees are going to bleed them dry!!!! TIME THEFT!! ~BoFA

Looks like it's supported on proton, silver

https://www.protondb.com/app/1315200

So install it through steam and it should be playable