Saving Data in Packages?

Hey guys,

I am currently working on my first package and I am used to create ScriptableObjects to save data such as settings. I then create a custom window for the users to adjust the settings and everything gets saved into the ScriptableObject.
However, this does not work in packages as far as I understand, right? Its not allowed to change assets located in the Package folder, therefore the ScriptableObject is greyed out (as you can see in the picture).

I wonder whats the best way to save data in packages? Of course I can use the PlayerPrefs but I dont very like this solution.

7758888--977061--Screenshot 2021-12-23 235206.png

https://docs.unity3d.com/Packages/com.unity.settings-manager@2.0/manual/index.html