I've also wanted to be able to do this. For instance, I have a button on a data item and i want the button to pass a certain value of the record from the l. It could be done differently by calling the parent of the button until you get to the instance where the record is located but it would just be easier to make the button pass a string that has a record id or a value from the record.
Is there a good way to do that? On the tap event, it also sends eOpts which send information from listeners if there are any, but it would be kind of nice if we directly set that value.