Using a custom model in real time with the pi hat and a camera

I am using a custom model, which has already been successfully converted to an .hef file. I would like to deploy it running on the raspberry pi hat in real time with a camera. I’ve modified the .json file used by the default rpicam to point to my .hef file instead of the default one and I’m using the command rpicam-hello -t -0 --post-process-file /path/to/json/file --lores-width [width] -- lores-height [height] and it seems to not be running my model. Can anyone clarify exactly what I need to change about this json file to make it run my model properly, or if there’s something else I need to be doing differently, let me know?