Graphical point input from Revit?

I’m a complete newb to Dynamo - I’ve viewed some tutorials, worked through a few and even been able to cobble together a few basic graphs. I have a strong AutoLISP background (although I haven’t coded anything in several years), but I’m not sure that’s a huge advantage for me learning Dynamo.

Regardless, one thing I have been struggling with is getting user input from Revit. One example in particular is driving me nuts. Is there any way to get simple point input from Revit - have the user pick a point and have those coordinates passed to Dynamo? I have found a function to allow the user to pick a point on a face, and that works great, but I’d like to be able to have the user simply pick a point on the current work plane and have that passed to Dynamo instead, but I can’t seem to find a function that will do that.

Am I wasting my time, or does such a thing exist?

Thanks in advance!