Making scrollbar for GUI.Label inside a draggable GUI.Window

Hi, i've got a draggable Window with a label inside.

In the label i got a string which includes a large text. The text is the large/long for the Label to show so i'm trying to make a vertical scrollbar so that you can scroll through the text.

I already got the draggable window with the label inside which includes the text. Im now stuck on making the scrollbar and so my question is if anyone can help/fix it for me?

This is my code:

     float windowRectWidth;
     float windowRectHeight;
     Rect windowRect;
     Vector2 scrollPosition = Vector2.zero;
 
     void Awake(){
                 windowRectWidth = Screen.width / 4f;
                 windowRectHeight = Screen.height / 2f;
 
                 windowRect = new Rect (20, 20, windowRectWidth, windowRectHeight);
         }
     void OnGUI() {
 
         windowRect = GUI.Window(0, windowRect, procedureWindow, "My Window");
 
     }
     void procedureWindow(int windowID) {
         GUI.DragWindow();
 
         scrollPosition = GUI.BeginScrollView(new Rect(10, 300, 100, 100), scrollPosition, new Rect(0, 0, 220, 200));
 
         GUI.Label (new Rect (10f, 20f, Screen.width / 4.1f, Screen.height / 2.2f), procedure);
         GUI.EndScrollView();
 
     }
 
 
 }