The QueryHeadPosition instruction, which is part of the HeadPosition instruction set, may be what you need. The documentation says that "the QueryHeadPosition function returns the face center point position."
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So if you want the screen space (image) coordinates, I think you are looking to project to Color coordinates?
The best match I could find to what you wanted was using the Image component of the LandmarkPoint instruction to get the color image coordinates of a landmark point on the face
An alternative to looking for a specific face landmark would be to get the color coordinates using the more general ProjectCameraToColor instruction.