Just put the python script in the /root home directory.
To install, make sure to:
opkg install python3 etherwake
Add the wol_service file to /etc/init.d,
chmod +x /etc/init.d/wol_service
Then enable and start it with
/etc/init.d/wol_service enable
/etc/init.d/wol_service start
You can stop and query the status of the service with:
/etc/init.d/wol_service status
/etc/init.d/wol_service stop
Then simple attach your webhook to your routers IP like so: http://router:5050/wol?mac=ff:ff:ff:ff:ff
To use iPhone shortcuts to wake your computer, create a shortcut that uses SSH to log into your router, then call curl http://localhost:5050/wol?mac=ff:ff:ff:ff:ff
This will allow you to use Siri to call the shortcut with a command like, "Siri, boot PC", or however you name the shortcut.