The post titled Will Xamarin support the new Android Architecture Component is the only info I found regarding Android Arch Comps for Xamarin Android so far.
There are 3 NuGet
Xamarin.Android.Arch packages released (last update 4 months ago), which only cover Lifecycle:
Xamarin.Android.Arch.Core.Common 1.0.0 Xamarin.Android.Arch.Lifecycle.Common 1.0.1 Xamarin.Android.Arch.Lifecycle.Runtime 1.0.0
What about LiveData, Room and ViewModel ?