First of all, welcome to our community! It’s good to have you.
I did some research for you but no luck. At this stage there doesn’t appear to be a way to turn on a computer with a switch. The problem being that in order to pair the switch with a device, the device already needs to be on. It’s definitely a good idea though. I have to ask someone to help me turn on my computer and then I can do the rest, but it is a bit frustrating to have to rely on someone else to get me started. Does anyone else know more? Perhaps a user or OT?