HI!
Yes you (we) can somehow "reverse engine" that scene.
First. this is an scene made up with keyframes. you can see it using timeline mod
View attachment 2706417
you can make your chara to move some faces features, like this simple example:
Keyframe: open mouth
View attachment 2706420
Keyframe closed mouth
View attachment 2706421
Running the anim we will se the mouth closes smoothy, depends of the "curve" you gave in the render (I sugest to look for a complete tutorial online, Youtube is a good start)
Well, understanding the basics we can "borrow" the artist work. How?
go to the scene and select the female actress, then in VNGE sss select clip manager and the clip itself, click on modify:
View attachment 2706428
In there you will see the entire setup of keyframes, look up on the ones related to face expressions.
View attachment 2706429
View attachment 2706430
Again, if you like to know how it was made, that is your answer, If you want to copy that for you use in another situation, then you have to deselect all the unwanted keyframes, leave only the usefull ones, save that scene as a new and then work on it.
I think that is a lotta work, I'r rather preffer make one from scratch.