just put a fucking meter in.
or eat the electricity.
no, there's no good way to measure it at that scale with any hack fuck method you're going to contrive for $50 dollars.
It's KWs of energy at 220V. This isn't some bullshit 15A circuit you can measure with a kill a watt. There are "smart home" amperage meters that use clamps, but you'll spend $500 on one of those. So again, just install a meter and be legit.
Electricity is really just organized lightning.