How to map an rtl433 single-event to Home Assistant via auto discovery?

Would anyone be so kind and share an example of how to map a simple “button” in rtl433 to Home Assistant?

I have a doorbell button which sends an event which appears like this in MQTT:
image

Which device do I best select?

An example of a YAML config entry in the homeassistant/ topic for auto discovery would be extremely appreciated, then I could use this as a baseline and work from there.