Can this work with watch only?

I got this to work using Shortcuts on the phone and was able to trigger it from my Watch's shortcuts app and via Voice on my Watch.

I want to be able to use my Watch even when my phone has died. Although I have a cellular Watch, it wouldn't work in that case. I thought the Watch would be able to make the API request by itself. Do you know if it's possible or if I'm doing something wrong?
