How do I pass in a GameObject as a parameter when I'm instantiating a class?

I have a class called "Items" that have certain parameters, one of which is a GameObject. However I have trouble with this one, as I can't seem to assign it, use a reference from anywhere, or anything really that would keep it in this one script. Only "ItemObject" is not working, maxStack and ResourceType works just fine.

When I tried to just use a normal reference it wouldn't let me without making it static, but making it static meant I couldn't add it in the inspector. I tried to create a function to add it in, but when called from another script with monobehaviour attatched it still wouldn't work. I tried to ad a reference to the static class, and created another script, but nothing worked.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Items
 {
     public enum ResourceType
     {
         Nothing,
         Iron_Ore
     }
     public ResourceType CurrentResourceType { get; protected set; }
     public GameObject ItemObject { get; protected set; }
     public bool Stackable { get; protected set; }
     public int MaxStack { get; protected set; }
 
     public Items(ResourceType _resourceType, GameObject _itemObject, int _MaxStack)
     {
         CurrentResourceType = _resourceType;
         ItemObject = _itemObject;
         MaxStack = _MaxStack;
     }


 
     public static Items IronOre = new Items(ResourceType.Iron_Ore,/*HERE IS WHERE THE GAMEOBJECT REFERENCE SHOULD BE*/, 100);