I'd like to replicate this kind of UI from sentence builder within workflows:

The image above shows monday's standard Outlook Calendar configuration.
While learning to do similar in workflows, I'd like the ability to replicate this UI.
In workflows we can use "sub fields" – https://developer.monday.com/apps/docs/object-fields – and because the calendar event in Outlook has a fixed number of things to configure, we can use a static schema without the need for a remote URL.
I'd done the following to configure the static schema:

I've connected this to the workflow action and promoted the version to live, but get nothing in the workflow:

What am I doing wrong? How can I get the UI to appear?
Here’s a quick video rundown of what is happening, or rather what is not happening:
