I was tempted to get one of those too but checked for HA support first. Have you tried sniffing the traffic to it to see how it’s controlled? Does the device/app work if you’re on your home network but the network isn’t connected to the internet (device doesn’t need cloud relay)?
My apologies for bumping an older thread but all these WiOn products are just a rebrand of the Ecoplug product line from Kab Industries . They are based upon the esp8266 (ex version). These can be reflashed to work securely via MQTT with no cloud exposure, etc. I just use a homie-sonoff sketch and reassign pin numbers. I have the RC-028W and CT-065W in my HA system.