Smart Meter values to Energy dash

Hi!

I have a Tasmota based reading head to get values from my smart meter via MQTT and the HA Tasmota integration. One of the sensor values looks like this:

image

Unfortunately, I cannot include this value in the energy dash since device_class, state_class and unit_of_mesurement are missing as mentioned here.

What am I doing wrong? What is the recommended way to get the values to the energy dashboard?

Thanks a lot!

Thorsten