Remote buttons in ZHA don’t have entities for the button being pressed. If you want to make an automation that runs when you press a button, you have to either be savvy enough to go into the dev tools and sniff the events so you can copy-paste them into your automation, or hope somebody wrote a blueprint for you.
This should really be easier. I guess that means either a change in the way ZHA presents the data to Home Assistant, or a more user-friendly way to add a device trigger to the automations.