Hello Sebastián Soto
RangeBar series feature is currently not achievable through the Xamarin.Forms implementation of the RadChart control. We have it logged in our Feedback Portal, you can vote for it and subscribe to status changes at the following link:
Add RangeBarSeries to Chart.
In the meantime, you could achieve it for Android and iOS after customizing the native controls - through custom renderers. Here are the articles that describe how to achieve the behavior on the different platforms:
So basically, you can create custom renderers to access the native controls and configure the setup through them.
Give it a try and if you have any additional questions or concerns, let me know.
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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