Republic of Jungle (free coop game from Steam)

I’m trying to get Republic of Jungle working. Republic of Jungle on Steam It’s currently free and I wanted to give it a try.

I installed both Lutris and Steam. I also had a look at Please read before asking for help but I don’t even know where to start. I was able to install the game via Steam to a folder in my home directory. But if I “Add Game” in Lutris, it doesn’t recognize it. I assume, the reason is that there is no “installer script”, yet?

Yes, this seems correct. I also cannot find the game at https://lutris.net/games