It makes sense that they would not change the skeleton, there's no real need to.
The face bones are there. I'm pretty sure they are being used i.e. when the jaw opens, bones for the lips and cheeks are probably necessary because blend shapes won't work at that moment.
But regardless, I see them, and I want them!
The rest of the rig makes it into Maya, working and animatable, so please apply the same transfer to the face bones
Thanks!