yes, it’s possible. The easiest way is to configure your remote sonoff to use your home MQTT. If you run mqtt at the office you can also bridge the two MQTTs (this is what i do). If you also run a HA at the office, there’s a custom component to connect them. If you open your home MQTT take care to have user/passwd/ssl and/or open it to just your office IP (if the office has a fixed ip).