Override an IMGUI Editor with UI Toolkit

Hi!

I'm trying to create a new Editor for the AnimationClip class, but I've seen that Unity has already one using IMGUI. The thing is that this quick test:

Code (CSharp):

1.     [CustomEditor(typeof(AnimationClip), true, isFallback = true)]
2.     public class AnimationClipEditor : Editor
3.     {
4.         public override VisualElement CreateInspectorGUI()
5.         {
6.             return new Label("This is a custom editor for AnimationClip");
7.         }
8.     }

Doesn't work, as Unity is using the default AnimationClipEditor instead of the one that I created.

Is there a way to force Unity to use my editor instead of the default one?
Any ETA on when the Unity's AnimationClipEditor will be changed to UI Toolkit?

Thank you!