Adding custom device with status query

I’m not sure if this is the right place, but I’m looking to have my PC added as a device to the SmartThings hub with it’s status given as on or off. I don’t need to it to do anything, just report if it’s on or not. I plan to have a SmartApp that allows me to send a wake on LAN packet, either with motion/presence or manually - which is why I’d like to be able to see the status of the PC.

I’m new to SmartThings and after several hours of googling I can’t see any clear way of doing this, please tell me I’m missing something?