Yes, it is possible.
Based on your previous question, I am assuming you're using one of the available trackers (e.g., trackerGNN) with a FilterInitializationFcn that returns a trackingEKF object, e.g., initcvekf.
To use the tracker, you must format your radar detections into an objectDetection format. Use this example (especially, the third section) to see how to define detections in a spherical frame.
Our built-in models, for example the constant velocity model, all support measurements in spherical coordinates and state definition in rectangular frame, which is exactly what you're looking for.
