Using Anychart widget, can provide enumeration values as input to chart with the help of Export Mapping & Json.
Mendix Marketplace - AnyChart use this link to get the module.
Here is the sample application to provide value to the chart, Mendix Marketplace - SunBurst Chart.
I guess, this may help you.
You can use the Pie-Chart widget. I would suggest to use a Non-Persistent entity. Please take a look at this example: