Ultrawide on Linux: can you tell a game to take up only the "middle"?

I'm considering buying a 1440p ultrawide display for my gaming machine (Linux Mint, Cinnamon X.Org). Is it possible to set certain games to only use the "middle" of the display? I ask because e.g. a game like League of Legends (it's my guilty pleasure, don't judge! 😂) doesn't seem like a good fit for ultrawide, and I'd rather...