Add Power Attribute to Sensor

[ad-ha]

Adding the power retrieved from the last reading as an attribute to the sensor. This implementation (instead of a separate sensor) does not require an additional query to the REST API

TO-DO:

• Change the attribute name to incorporate into translation
• Set a standard name for templating
• Add Units (currently value is retrieved in W)

[ad-ha]

Esto sería el resultado final después de añadir este atributo:

Y con templating (con el código actual) se podría sacar un sensor separado:

{{ state_attr('sensor.i_de_es002xxxxxx_accumulated', 'Last Power Reading') }};