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."
QueryHeadPosition returns is the depthCamere space, not the screen space...
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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.