How to import unity-ads.aar or any .aar into Xamarin?

Question

I am trying to use UnityAds in a Xamarin.

1. Download the SDK from github.(unity-ads.aar)
2. In the solution I create a new project of the type: Android Bindings Library (Xamarin)
3. Add the "unity-ads.aar" file to the "Jars" directory.
4. I access the properties of the "unity-ads.aar" file and select "Build Action" = "LibraryProjectZip".
5. In the project of the same Solution, I access References and add the newly created one.

If you compiled individually or together the project that contains the .aar it returns many errors.

This is not enough? What am I forgetting?

Ref.:

• https://developers.google.com/admob/android/mediation/unity
• https://github.com/Unity-Technologies/unity-ads-android/releases
• https://docs.microsoft.com/es-es/xamarin/android/platform/binding-java-library/binding-an-aar