Best product or method to monitor ip65 external plug energy usage

Hey, new to HA and was wondering if there is a recommendation on product or suitable way to monitor energy from a hot tub that is connected via an IP65 external power source. I have a zigbee hub for some temp/humidity sensors that are in HA. I’ve seen external smart ip65 sockets that could monitor energy usage but also noted that some state not to plug in things like hot tubs so wondering if there is anything else that could be used.

Really I’m looking to see how much kwh the tub uses year round

Thanks