Is it possible to set a cover art image for non steam game?

I have added a foreign (non steam) game to steam library. If I right click at the game in the list and choose properties, a new window appears. There you can set to force use specific proton version, set game name (instead of seeing an exe file name as game name), also if you click on the square near it, you can choose an icon that will be used for the game when listed in library.

But I do not see an option there how to set a game banner image (the big picture that you see on the top when you choose the game in libray). Currently there is just blackish rectangle and the text of the game name.

Is it possible to add a background image for the non-steam game?

Solution 1:

Yes, it is possible. But it is set from another place, not in that properties window. You need to right click on that area without background (on the blackish rectangle), then select "Set Custom Background", then file selector window will appear.