Can't assign Steam Controller grip buttons as a button chord

[Rhomagus]

When assigning a chord button combination only L5 and R5 are options. Unfortunately, L5 and R5 are NOT LG and RG. L4 and R4 *might* be but those aren't listed in the menu as possible options. The Deck's controller configurator recognizes the Steam Controller's back paddles as LG and RG but those buttons are absent from the Button Chord sub menu.

In addition, there's inconsistencies in the menu pertaining to the triggers. The top menu on the Deck in the edit layout uses L2 to represent the triggers but in the actual trigger sub menu, they're listed as LT and RT.