On a zero head V4, I set the simple smile to 1 and mouth height to -2.38. I then did Object/Spawn Morph Target. I guess you could export this morph and then load it to your character. Or do a Figure/Copy Morphs from this V4 to your character V4.

---

W11,Intel i9-14900KF @ 3.20GHz, 64.0 GB RAM, 64-bit, GeForce GTX 4070 Ti SUPER, 16GB. 

Old lady hobbyist.

All visual art or fiction is "playing with dolls."