How to detect number of occupants | Blue Presence Sensor dimmer VZM32-SN

I have the Blue Presence detecting dimmer in Home Assistant over ZHA, and a very simple question:

How do I count the number of occupants in the detection field?
I appreciate this isn’t always going to be 100% accurate, but normally, a presence sensor would tell me if there’s 1, 10, or 50 people in the detection zone.

As far as I can tell, the only accessible attribute is whether presence was detected or not, but not any more specific details.