Hello, I'm a VTuber, or a content creator who uses a virtual avatar instead of my real life face for presentation. I've been trying to use the iOS implementation of ARKit to get face tracking working, but noticed a major issue, especially for my purposes. ARKit appears to move both eyebrows the same, regardless of whether or not I am physically moving my eyebrows the same. Every ARKit based application I've used simply mirrors eyebrow movement. Is there a fix to this, or is this just a bug currently in the software?