There’s no official capability, that tone is funny 
, sometimes it feels like they have to pay to create new capabilities or modify them.
Does that beep have user interface in the device screen? I’ll have to check.
Identify supports the number of seconds it will be blinking or 0 to stop the blink so I would create a more flexible capability with the time as an argument. Or, if you want to reuse that beep, maybe add the time as a setting.
Zigbee and Matter Edge libraries support it so at least invoking the command from a custom driver is easy. Andreas already linked to a Zigbee driver using it, this is how it would look in Matter:
device:send(clusters.Identify.server.commands.Identify(device, endpoint_id, duration_seconds))