I use the ZHA event like this.
platform: event
event_type: zha_event
event_data:
device_ieee: 94:34:69:ff:fe:57:d5:58
unique_id: 94:34:69:ff:fe:57:d5:58:1:0x0006
device_id: e676acf4e9302472d8d7d81896f9ed6b
endpoint_id: 1
cluster_id: 6
command: "on"
I copied all the event data that I found when I pressed the button and saw these items revealed using the Developer tools... Events... Listen to events...
I then subscribe to the zha_event
I hope that gets you in the right direction.