Expose Chart Variables

When you click a chart to do something (show a modal for example), you often need to pass what was clicked to that modal. Right now, this is done via {{$Chart.point.name}}. This variable is nowhere to be found, I have to manually type it.

I don't have the Skuid background to know these things offhand, so I'm not even sure what other possible chart variables there are. Can you expose chart variables the same way you do other model variables?