Jon Vöge sends along some data:
A common misconception about Translytical Task Flows is that the only way for you to parameterize and pass user inputs to the User Data Function, is through Slicers in Power BI.
That is not true at all.
In fact, one of the most powerful ways of integrating Task Flows into your Power BI reports, is by allowing user selections made in visualisations in your report, flow through to your task flow.
Read on to see how you can do this.