Show nested ScriptableObject in Inspector

I`m new to Unity and i want to know if it`s possible to show nested ScriptableObject (SO) in Inspector. I want to click at the NPCSettings Asset and show all nested SO in the inspector, so that i can everything in one asset.
Is it possible to do that?

For example, i have 4 SO`s that are linked together:

Code (CSharp):

1. public class NPCSettings : ScriptableObject
2. {
3.     public Status status;
4.     public Task[] tasks;
5. }

Code (CSharp):

1. public class Task : ScriptableObject
2. {
3.     public float startTime;
4.     public float endTime;
5.  
6.     public TaskType type;
7.     public Routine routine;
8.  
9.     public bool isInterferenceTask;
10. }

Code (CSharp):

1. public abstract class Routine : ScriptableObject
2. {
3.     public AnimatorStateController animatorStateController;
4.  
5.     public abstract void ExecuteRoutine(Animator animator);
6.     public abstract bool HasRoutineFinished();
7. }

Code (CSharp):

1. public class Status : ScriptableObject
2. {
3.    //Lots of Attributes
4. }

 

Found this
https://gist.github.com/tomkail/ba4136e6aa990f4dc94e0d39ec6a058c

 

You can make those vanilla classes instead ScriptableObject and give them attribute [System.Serializable]