How to set stock Shelly Last Will

I’m using a Shelly 2.5 with the latest stock firmware and MQTT.

I saw a review of the 2.5, and at the bottom of the MQTT section, there was a place to put a Last Will topic. With the latest firmware that’s not there.

I tested by unplugging a Shelly and the MQTT broker does not send anything. Is there a way to set the Last Will message, or is there some other way to know that a stock Shelly is offline?

Thanks, Richard