How to make a custom class that is serializable and works in a custom editor gui array which imitates the real inspector array?

Hello everyone!

I've began ramming my head into the nearest wall because of this custom editor gui interface I'm writing. I have made an array as described by steinbitglis in this thread.

My own implementation(Not the complete code, but what's used, from // --- Array for items and down it's inside the OnGUI function):

     // Used for array of combinable items
     public List<Vector2> combinableItems = new List<Vector2>();
     private SerializedObject m_Object;
     private SerializedProperty m_Property; 
 
     public void OnEnable()
     {
         m_Object = new SerializedObject(this);
     }

     // --- Array for items
     m_Object.Update();
     m_Property = m_Object.FindProperty("combinableItems");

     while (true)
     {
         Rect newRect = GUILayoutUtility.GetRect(0f, 16f);
         bool showChildren = EditorGUI.PropertyField(newRect, m_Property);
         EditorGUILayout.Space();

         if (m_Property.NextVisible(showChildren)){}
         else
         {break;}
     }

     // --- --- Apply the property, handle undo
     m_Object.ApplyModifiedProperties();

I want to have each element in the array to have two values, two strings. I was thinking "hey! A vector2 can be used here!" but then I found out that only certain characters can be entered into the input area. Is there some way to make a class which would work with this kind of imitated array? Just as the vector2 does, but having strings as values instead?

I have no clue how to do this as I'm not very good with this whole serializedObject/Properties/Custom Editor Array business. Thanks alot for just reading this, and even more thanks if anyone can help. :) H

Have a good day/night!