Average Real Time power from energy

Sorry if newbie question,

I currently have a hildebrant glow energy monitor. This pulls data from a UK SMETS2 meter and sends to MQTT for which I’ve configured several sensors.

I am interested to know rough real time power export. The only metric for export currently is energy which updates every 10Wh or about every minute.

I’ve played with derivative helpers but not sure if this is the best way.

Any ideas?