How to resolve the conflict between Metahuman's mouth and body?

Development Character & Animation
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When using Live Link, it is normal for the head to move and the mouth to make movements when the body has an animation. However, there was a problem when using Metahuman SDk’s Talk, which is “voice to speak”. When the body has an animation, the entire head will return to the initial state to speak.

like this:

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Should I modify the Animation Blueprint? Or use another method using Audio2face?

My question (actually probably the same question):

  1. How to make the body move so that only the mouth moves when speaking?

  2. How to split the head part, that is, the Live Link only controls the eyes, or only the mouth, or only a certain bone (controlling the Rig)?

If you can, please try to give a complete picture display, I am a newbie, thank you!