Hello, Is it possible to designate custom cell shapes? Something like the following: <img src="https://user-images.githubusercontent.com/58456893/229670001-0510342e-b95e-4996-bba5-5633fde9de4b.png" width=30% height=30%> CellPose can generate `.geojson` files that contain polygon outlines for individual cells. Thanks, Harry