You would have to script something based on whatever service is actually being used, or maybe node red? In the past, way back, I used something like this that is just a simple web page that the user has to click a button to start the machine - there are a bunch of these github.com/Trugamr/wol - the web server is on the lan with the NAS so can send the magic packet, but the page can obviously be served over the internet.