Siri Custom Intent Parameters

Simple question. I know this has been asked before but the iOS 14/2020 WWDC videos seem to imply things have changed. I want a Siri intent to gather a parameter via voice for me. The generalized use case is that I want Siri to understand a command and pass me the trailing parameters. E.g.:
"Hey Siri, create new task 'My Task'"

I want this to invoke an intent and pass the "My Task"
(string) parameter value to my handler.

I know previously this was not possible. But the WWDC 2020 example projects (e.g. Recipe Assistant) seem to imply parameters can be passed via voice. However, nothing I do will enable Siri to pass me a parameter from the voice command. When creating a shortcut for this intent there are obvious placeholders for variables- but they are not recognized.

Is this still not possible? Siri already translates trailing parameters to text. Siri shows it when trying to search. Is it really true this translation will not be passed when attempting to invoke an intent- still?

Or am I simply missing something? I hope so.