If I understand you correctly, you want a graceful shutdown of the computer that doesn’t require physically touching the computer?
If so, that’s what “wake on LAN” is for. Most PC operating systems now support it. It allows you to send a remote command over your local area network to tell the computer to shut itself off or to turn itself back on.
Assuming you have that option enabled on your laptop, it should be pretty easy to set up something to initiate it.
If you search the forums for “WOL” you should find some discussion. You can’t do it directly from the smart things hub, but you can involve an additional device to issue the WOL commands.