The facial control in Genesis 8 uses some issues from Genesis 9

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I used the facial controller from 8 on the face of 9, and then exported it to Blender. Apart from my own bones being functional, the facial controller did not react at all.

Padone

You must also import FACS for the controls to work, as the face rig drives FACS. If you use easy import with the G9 preset then FACS are selected by default.

p.s. Note that in daz studio the G81 face rig doesn't work on G9, in blender it does because Thomas fitted it.