Total pellet usage and total kWh for Energy dashboard

[realthargor]

First of all thanks for the awesome integration.
Works flawless. :)

One thing I'm struggeling with is to add the pellet usage to the engery dashboard.
I know it is called "Gas usage" but technically it just expects a metric in kWh which can be calculated from the pellet usage.

I tried to achieve this by setting up a utility helper and a template metric to calculate the kWh from the kg.
And then there is this mess, which might help:
https://community.home-assistant.io/t/calculate-cumulative-total-sensor-from-daily-total-sensor/335275/6

I was wondering if you know how to achieve this or if it even might be something the integration itself could provide directly.