Have you ever heard of VITAMINS?💊 It's a vtuber tracking app that can take input from ARKit apps like VtubeStudio or MeowFace. Those values can be sent off to your desktop VtubeStudio, so your model can have really special mouth forms, like funneling your mouth, baring your teeth, making a kissy face, or making an mmmmmm sound mouth shape! VBridger does this as well, but it costs up to $30 (vs Vitamins being FREE) and has a little more versatility with it's Javascript incorporation. Let me know