There is a trick to use Siri to open the web shortcuts generated by the Endpoint Example. This is an example of what I’m doing.
Create a contact - I call my contact “Smarthome Shortcuts”. Then scroll down to the “add URL” section. Name the URL to your liking - example: Turn off bedroom lights. You can create as many URL shortcuts that you want. Now, save the contact, hold the home button down to activate Siri, and say “Smarthome Shortcuts”. Siri will show the list of all the URL shortcuts you made, tap the shortcut - Safari will open the shortcut and perform the action - in this example: the bedroom lights will turn off.