Utility_meter: calibrate last_period attribute

I’m using the utility_meter integration and I would like to calibrate the last_period attribute as I’m using it to calculate and compare energy cost.
Would be useful for people like me that started to monitor energy in the middle of the year or month and would like to compare to the last period. Will be useful also when data went missing due to an issue in monitoring energy for example.

It’s inconsistent that utility_meter sensor for current period do have calibrate service, while last_period does not have.