Convert MediaPipe FaceLandmark result coordinates to 3D space coordinates

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Hi,
I am using MediaPipe FaceLandmark to detect a specific point on face and show a 3d model on face. I am getting coordinates as normalized values. I want to convert theses values to move a 3d model (the 3d model accepts position in world space units). So how can I map the facelandmark result to world space. (I am using Three JS to show the model)

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