Access start date data via Shortcuts?

If I set a start date on a reminder, (how) can I access that detail via Shortcuts, if I want to use it for some other automation?

If this is (or can be) possible, it could also provide a method for converting reminders into events (as requested here: Suggestion: Copy task to event)?

You can add new task with specific start date on shortcuts but nothing else.

Since start date is not supported well in Reminders app, it's only partially supported on GoodTask.