After going open source back in mid 2022, the Wii U emulator Cemu started providing experimental builds with Linux support and now it's out proper with the new Cemu 2.1 release.
If you don’t have any other emulators set up, i would recommend to just use emudeck, its supposed to help set up all the emulators that you pick and sets the recommended settings and controls for the steam deck.
If you don’t have any other emulators set up, i would recommend to just use emudeck, its supposed to help set up all the emulators that you pick and sets the recommended settings and controls for the steam deck.