Detect which local player clicked a button

Hi, I am using the new Unity input system and have a button in the UI. Any player is allowed to click this button but I want to know which Player it was.

I have extended the Button class from Unity so that the EventData is passed as a parameter. But how does one know which Player sent this event.

Here is my button overload:

 public class ButtonEx : Button
     {
         // Function definition for a button click event with EventData.
         [Serializable]
         public class ButtonClickedExEvent : UnityEvent<BaseEventData> {}
         
         // Event delegates triggered on click with event data.
         [SerializeField]
         private ButtonClickedExEvent m_onClickEx = new ButtonClickedExEvent();
         
         public override void OnSubmit(BaseEventData p_eventData)
         {
             base.OnSubmit(p_eventData);
             
             if (!IsActive() || !IsInteractable())
                 return;
 
             m_onClickEx.Invoke(p_eventData);
         }
 
         public override void OnPointerClick(PointerEventData p_eventData)
         {
             base.OnPointerClick(p_eventData);
             
             if (p_eventData.button != PointerEventData.InputButton.Left)
                 return;
 
             m_onClickEx.Invoke(p_eventData);
         }
     }

Specifically how would I get the PlayerInput instance that clicked the UI button?

I reason I would like this information is so that I can determine which Player should control the next UI prompt or should be assigned the Player 1 slot.

Thanks!