The Steam Frame runs SteamOS, just like the Steam Deck, but I assume with significant improvements for a 3D VR experience. KDE Plasma will probably just appear as a 2D region within the 3D view.

Numeric types have a default value of 0 (uint8/16/32/64, int8/16/32/64, float32/64), boolean defaults to false, slices, maps, and channels all default to nil.