Good afternoon, I am modifying the inspector to suit my needs.
This may sound selfish, but I would like to have access to some fields without changing your code (I think there is no need to explain why)

By modernizing the SkeletonAnimationInspector
In my specific case, I needed a variable (protected SerializedProperty skeletonDataAsset)

I got the result I needed. But I ran into a problem when I wanted to do this with
SkeletonGraphicInspector

Because its property data does not have an access identifier, which automatically makes the variable private, further inheritance is not possible, unlike SkeletonAnimationInspector

Is it possible to provide for this point in subsequent updates?

I think this will be useful for those who write their own utilities for their own needs.

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It seems you are looking to modify the Unity inspector for Spine components to access certain fields without altering the original code. Specifically, you want to access a protected SerializedProperty in SkeletonAnimationInspector and are facing issues with SkeletonGraphicInspector due to its private access level. While modifying the inspector to suit your needs is a common practice, the current design of SkeletonGraphicInspector does not allow for easy inheritance due to its private fields. Unfortunately, without changing the original code, accessing these private fields directly is not possible. However, you can consider using reflection to access private fields, though this approach can be fragile and is generally not recommended for production code. It might be beneficial for future updates to consider making these fields protected to allow for easier customization and extension by developers.

The place I'm talking about

I don't want to seem arrogant.
This sentence is purely positive.

Thanks in advance

@TheZero Sorry for the inconvenience. We've fixed the access modifiers from private to protected of the SerializedProperty members as well as a few methods like OnEnable (see this commit).

A new spine-unity 4.2 unitypackage is available here as usual:
https://esotericsoftware.com/spine-unity-download

Issue ticket for later reference:
EsotericSoftware/spine-runtimes2715

    Thank you very much)
    You probably have the best support code base.

    Harald