Multiple axes functionality is not yet available for the Xamarin.Forms implementation of the Chart control. We have it logged as a feature request in our Feedback Portal, you can vote for it and subscribe to receive notifications when its status is updated at the following link - Multiple Axes for Chart.
Still, you should be able to achieve it after customizing the native controls - through custom renderers. Here are the articles that describe how to achieve the behavior on the different platforms:
iOS: Axes Overview. You can check the Multiple Axis example in the iOS Samples application(It is located in your local Telerik UI for Xamarin installation, in the Examples/iOS folder)
So basically, you can create custom renderers to access the native controls and configure the setup through them. I have added a sample application that shows how to achieve the behavior in Android. The approach is the same for the iOS and UWP. Please review the sample and let me know if you have any questions or concerns.
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