Currently, the Pie series type
doesn't have a doughnut series option, you can see all the supported types here
We currently have this feature request in the Feedback Portal
to implement this and the feature request has been approved. The development team uses that portal when planning and implementing new features, you can add your up-vote by clicking the like button to increase the priority of the feature request.
You will see the status change to "in progress" when we've started building it and "completed" when it's released.
Please let us know if you have any further questions.
Lance | Tech Support Engineer, Sr.
Telerik by Progress
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items