Homekit wrong device class

Hello, I have a sensor for gas detection. The sensor is shown up in HA as gas sensor, on my iOS device as motion. How can I change the device class for Homekit? Where can I find the Homekit config file? Regards

Double check the device class in home assistant. According to documentation gas is supported and it falls back to occupancy for other cases.

I‘ve already checked, the device class in HA is correct. Any chance to change just for HomeKit?