Thank you for your feedback and the feature request. At the moment, RadMap is not supported for UI for Xamarin, but it indeed would be a great feature to have. You can vote for it at our UI for Xamarin Ideas & Feedback Portal
which will increase its priority in our list.
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