More advanced electricity meters can measure amount of imported/exported energy that is both active and reactive.
Reactive energy is measured in VArh, just like Wh for active energy.
That means, support for VArh, kVArh, mVArh, gVArh should be introduced.
[homeassistant.components.sensor] Entity sensor.meter_1_import_reactive (<class 'homeassistant.components.modbus.sensor.ModbusRegisterSensor'>) is using native unit of measurement 'kVArh' which is not a valid unit for the device class ('energy') it is using; expected one of ['TWh', 'GJ', 'kcal', 'Mcal', 'MJ', 'Wh', 'kWh', 'mWh', 'cal', 'kJ', 'MWh', 'Gcal', 'J', 'GWh']