YoloV8 NMS Json parameters

Hello. I am trying to compile a custom YOLOV8n model as an OCR and was interested in configuring how the NMS works. In particular, I wish to implement class agnostic NMS. I found by using hailortcli parse-hef that the post process has options Cross Classes and NMS results order. Does this enable class agnostic nms and sorting detections by position? How do I set these parameters as I cannot find reference to them in the JSON files in the hailo model zoo repo