It seems there are not a panel with a button…
This could be a great idea to developers, allowing users to interact with the actuators…
EDIT:
This could help you…
But you have to make a request parser and convert it to a MQTT message. It is not difficult, but at the moment this is what’s available at the moment.
.
.
.
.
EDIT 2:
I found this awesome panel, but I did not try it.
I think it is what you are looking for: