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Selfhosted
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I suggest to read up on the way Wake On Lan works, it's pretty neat. it has to send a packet to a local broadcast address. I don't think that can route over the internet so you need some device to send the packet from on the network or over a VPN connection.
For the KVM part, that model server should have some form of remote control. I think they called it the Integrated Management Module (IMM) on those things. The IMM is running as long as the server has power, it's a tiny independent system. They have various licenses/feature sets but at minimum it should get you a web interface to see status of the server as well as power it on & off. It may also have remote console and media options but those are add-on costs so not everybody buys them. The default login information should be somewhere on the chassis unless it was removed or got lost. The old defaults used to be username all uppercase 'USERID' with password exactly 'PASSW0RD' with a zero instead of the letter O. I don't recall when they changed to newer methods but it's worth a try.
Hey there! Thanks a lot, someone else has proposed using IMM and I’ve found an official IBM manual on Lenovos webpage for all of this. Only an additional question, what is the expected power draw when only the IMM is on? I’ve got no way to actually check it, and the main reason to use it is to save power
Unfortunately I don't have any servers to test that anymore and power was never a major concern at the time. Also a different use case, for me I've always used IMMs to remotely setup and troubleshoot for servers that I expected to be up 24/7.
You need to start learning about ipmi, try googling ipmitool and the name of your server.
Is it possible to set up WoL on a normal desktop computer?
That varies depending on the computer/motherboard manufacturer and model. The manual may reference that feature but if not can go into BIOS/UEFI setup menu then browse through looking to see if there is any option to enable it. Also I've only used it with built-in NICs so not sure if it's an option with add-on NIC.