Send a simple command to Siri to start a shortcut

[JBrown]

I don’t have a LG TV so I don’t know what way would be the easiest.

Have you looked at this thread?

[PORT] LG Smart TV Discovery 2012+

This is a port of Smarththings LG TV App and Driver. I have only tested it on my one TV. App 0.1.1 Ported LG Smart Tv from Smarththings Driver 0.1.1 Ported LG Smart Tv from Smarththings Issues Unable to turn tv on (tried Wake on Lan unsuccessfully) Settings not carrying over from App to Driver Cheers Mike https://github.com/ekimmagrann/hubitat/tree/master/lgtv

There three different nodes in node-red to control a LG TV.
https://flows.nodered.org/search?term=Lgtv&type=node&type=flow&type=collection

There also appleTV, Alexa and Hombridge nodes for node-red.