There was an incomplete implementation a few years back, but it was on a separate branch (wiispeak) that AFAIK got lost during the Google Code => GitHub migration. I might still have a backup of it somewhere, but I have to dig. Dolphin's codebase also changed A LOT since then, it would probably need to be rewritten...
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 16 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)