(Custom WIndow) Access class color from another script and override it

Hello,

after days of not finding an answer to my problem i finaly have to ask here myself.

I want a custom window for applying new colors to an array of colors depending on the rule.

Example script with the list:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class List : MonoBehaviour {
 
     public MyClass[] myClass;
 }
 
 [System.Serializable]
 
 public class MyClass
 {
     public int rule;
     public Color color;
 }

My thought was that i just drag and drop the object into an object field so i can access the class. depending on the "rule" variable i would apply the new colors.

Example here: using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEditor;

 public class ChangeClassColorEditor : EditorWindow {
 
     public GameObject targetObject = null;
 
     public Color setColor1;
     public Color setColor2;
     public Color setColor3;
 
     [MenuItem("Window/Test/Change Color Tool")]
     public static void ShowWindow()
     {
         GetWindow<ChangeClassColorEditor> ("Change Color Tool");
 
     }
 
     public void OnGUI()
     {
         targetObject = (GameObject)EditorGUILayout.ObjectField (targetObject, typeof(Object), true);
 
         setColor1 = EditorGUILayout.ColorField ("Rule 1 color", setColor1);
         setColor2 = EditorGUILayout.ColorField ("Rule 2 color", setColor2);
         setColor3 = EditorGUILayout.ColorField ("Rule 3 color", setColor3);
 
         if (GUILayout.Button("Set color"))
         {
             Debug.Log ("Set color pressed");
 
             SetColor ();
         }
     }
 
     private void SetColor ()
     {
         if (targetObject != null)
         
         {/*
             if (rule = 1)
             {
                 color = SetColor1;
             }
 
             if (rule = 2)
             {
                 color = SetColor1;
             }
 
             if (rule = 3)
             {
                 color = SetColor1;
             }*/
 
         }
 
         else
         
         {
             Debug.LogWarning ("Objectfield is empty !");
         }
     }

Question now is: Is it possible what i want to do? if yes how do i do it?