Making an ingame character editor from animations

I’m making an in-game character editor. I have a model, a skeleton and an animation set. The animations are quite short, they just change the “pose” of a part of the character’s face (nose, lips, ears, etc.). I’ve seen tutorials that make such character editors with multiple models and sliders tend to change the model to a specific model, but I don’t know how to do the same with animations.
This is where help is needed, how to create a character editor with sliders that will change the nose, lips, etc., having the original character and “single-frame” animations in which the shape of the nose, lips, etc. is changed?

You can check Pose Assets and Morph Targets