It seems this is should now possible with the Clear Column action — but it’s not working as I’d hope.
When you use the Clear Column action, it clears the value right away and doesn’t pass the values to the form as Column values. It would be GREAT if the entered values could stick and be passed as Column values THEN cleared.
In my mind, if the Open Form action is before the Clear Column Action, those columns should still pass to the Form, but they’re not.