Add thrid party entities into the card (as Simple Thermostat does)

[HACS-bank]

In a room with no fixed heating, I am using a smart socket and plug-in electric heater.

The heater has physical selections for 750W, 1250W or 2000W, and a built-in physical thermostatic switch.

The smart socket has a sensor for energy consumption rate.

It would be good to display the actual power of the heater on the lovelace card, when a sensor is available.