How does expression control curve affect the material parameter in metahuman

Development Character & Animation
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1

I find these blueprint in Rig Graph of Animating Rig

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When I unlink the node of the curve CTRL_expressions_browRaiseInL, then I find the parameter head_wm1_normal_head_wm1_browsRaiseInner_L of material metahuman used is not working.
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So I think the CTRL_expressions_browRaiseInL can affect the value of head_wm1_normal_head_wm1_browsRaiseInner_L. However I can’t find the code of these. So I want to know how these works.

2

Do you understand how it works?I have the same problem.