Getting a target's gameobject in custom editor

Hi' I've got these classes:

A component MyClass

 public MyClass : Monobehaviour
 {
     public Vector3[] positionList;
     private MyData = null;
     
     void OnEnable()
     {
         if (MyData == null)
             MyData = new MyData(this);
     }
 }

And a class for its data:

 [System.Serializable]
 public MyData
 {
     private int intData = 0;
     
     private MyClass ownerClass = null;
     
     public MyData(MyClass myClass)
     {
         ownerClass = myClass;
     }
     
     public int IntData
     {
         get{return intData;}
         set
         {
             intData = value;
             gameObject.transform.position = GetPosition(value);
         }
     }
     
     private Vector3 GetWorldPosition(int value)
     {
         return ownerClass.positionList[value];
     }
 }

And an editor class: [CustomEditor(typeof(MyClass))] public class MyClassEditor : Editor { private SerializedObject myClassSO; private MyClass myClass;

     void OnEnable () {
         myClassSO = new SerializedObject(target);
         myClass = (MyClass)target;
     }
     
     public override void OnInspectorGUI()
     {
         myClassSO.Update();
         
         base.OnInspectorGUI();
             
          myClass.MyData.IntData = EditorGUILayout.IntField("Position type: ",  myClass.MyData.IntData);
         
         if(GUI.changed){
             EditorUtility.SetDirty(target);
             EditorUtility.SetDirty(myClass);
         }
         
         myClassSO.ApplyModifiedProperties();
     }
 }

It's just a simplification of the real class. But what I wanted to do is to have a custom editor that will change a data by using a property of the variable. In its property, I wanted to also change the transform.position of the gameObject, that's why I also set the value of the MyClass object that has / owns this data in the constructor of MyData. This code works when I pressed play. I can change the value of MyData.IntData and the transform.position of the gameObject just fine. However, in the editor mode, it didn't work because the ownerClass instance is null. Unfortunately, I also need it in the editor so I can change it without having to press play to see the result. So how do I do it?

Thanks in advance.