How to force custom editor to use inherited custom editor instead of the base one?

I am trying to add functionality to custom editor that is from a package.
So i wrote my own customeditor that is inheriting the custom editor from the package.
How do i force the custom editor to use mine inherited one, instead of the base one?

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So you’re using MonoBehaviour A from the package, you have custom editor class AEditor.
You can make a class AExtended : A
public class AExtended : A

then make a custom editor class AExtendedEditor for AExtended

[CustomEditor(typeof(AExtended))]
public class AExtendedEditor : AEditor

then you replace the component A in your GameObject with the new component AExtended.