I have a few basic mods set up, they work just fine when launching on my desktop. The launcher allows me to select the play with mods option. When i launch the game from gaming mode on the Steam Deck there is a single set of launch options from what seems to be a really pared down launcher.

1. Play Xcom 2
2. Play Xcom 2: WotC

As you can see, neither of those are "Play with Mods". Any help would be greatly appreciated.