In `Xamarin Forms` I can't find a component for a `RadioButtonList` (like in WinForms or WPF) and also it's not bindable. With this component you have a bindable `RadionButton`. You see an example below for Android.

Bindable Radiobutton for Xamarin Forms - Android version

 

Example for iOS

BindableRadioButton for iOS

 

Example for UWP

BindableRadioButton for UWP

This component has its implementations for each platform (Android, iOS and UWP). You have to install them or create your renderers.