Secondary button to sound doorbell

I have a videodoor bell pro 2 and 2 spotlight cameras, the doorbell is on my front door and the cameras are on the 2 entrances to my drive, it would be really grand if a couple of secondary buttons could we put on the gates so delivery drivers could "ring for attention" while the gates are closed. Even if it was just an API call, I've no problem programming a button to do the work myself