Look into a FortrezZ MIMOlite. It is a z-wave device with a dry contact relay that can be configured either as a latched relay or as a momentary relay. Lots of people configure it is a momentary relay to control a garage door opener. Comes with its own power supply.
Another choice is to make your own Hubitat controlled momentary switch as is described in these posts about a zigbee garage door opener.
