This sample compares countries by population density and total area using various radius in a pie series.
In this example, you can see how to render doughnut chart with different radius. You can use radius mapping property to achieve this feature. dataLabel is used to represent individual data and its value. In addition, the sample shows how to shift the order of the legend for the doughnut chart by using the reverse property. More information on the various radius in pie series can be found in this documentation section.