How to set mouth to be downturned with facial tracking?

[languid vapor]

My model almost always smiles but it does have a downturned smile parameter. I can only set it as a hotkey to get activated but it won't work via facial tracking. Any way to do this? Like the pic attached

[loud lark]

None of the current trackers properly track frowning, it's a much more subtle expression than smiling.

Partially because frowning is mostly brows.