Yes, just add filter: key and space it out like the docs suggest for the current format. Don’t have to test anything.
This is the same as all entity and device selectors now all blueprints.
Fixed locally and tested, indeed the only change is filter:
I use this Aquara button (WXKG11LM) with Zigbee2MQTT, and I created an automation who is triggered by the single action of this device, but seems the single action state is to short for fire the automation. So I’am not able to use this button. Have someone have this kind of problem?