Homekit Controller Security System

I setup a Homekit compatible alarm/security system through Homekit controller and it looks like everything is working except for one of the the states I was hoping for. It looks like I can get states for Armed Home, Armed Away, and Disarmed. I haven’t tried Tiggered, but from the code it looks like it should support that. However, I do not get the Arming state (when there is a countdown/delay to arm away). It looks like the Alarm control panel supoorts that (STATE_ALARM_ARMING) and I can see an Arming state in my Apple Home App, so it looks like it is being reported. Is there anyway to add that capability? I wouldn’t mind doing it myself, but am very much a newbie with Home-assistant development and not really sure where to start.