Currently the CallFlowRefAction only allows the flow reference to be a constant value, but we would like to configure this from a variable expression.
Now there is a Query CLU action, the ability to trigger a flow from the result data, rather than having to hard code via switch, etc.
We would ideally like both the expression and constant value options within Call Flow. Allowing both, either from a picker or from an expression, means that when the picker is used there is less chance of us making a mistake.