Polar/Radar Charts in Visual Analysis

In Logi Info Studio v14.1.051 we are able to set the "Polar" property of a Chart Canvas to True in order to create a Polar/Radar chart rather than a standard bar chart. This works successfully and looks great when displayed as a dashboard widget.

However we'd also like to be able to do this via Visual Analysis when creating custom widgets. There is very flexible functionality to create bar charts, etc. but we can't see a setting to turn them into Polar charts as there is for the fixed charts created in Studio. Is it there any way to enable this so that users can create their own Polar charts?