Linking Image to item list

Hi guys, I currently have a button that generates random items to my inventory, currently the script only displays the text of the item and amount but I can't seem to find a way to link a image for each item. What would be the best way to approach this.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class ItemController : MonoBehaviour
 {
     public static ItemController Instance;
 
     public Item[] availableItems;
 
     public Text itemDisplayText;
 
     void Start()
     {
         if (Instance!= null)
         {
             Debug.Log("ItemController - Can only have 1 Instance!");
             return;
         }
 
         Instance = this;
     }
 
     public void GetItem()
     {
         Item item = availableItems[Random.Range(0, availableItems.Length)];
 
         InventoryController.Instance.AddItemToInventory(new ItemStack(item, 1));
 
         itemDisplayText.text = item.name;
     }
 }

Item Stack code

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class ItemStack
 {
     public Item item;
     public int amount;
 
     public ItemStack(Item item, int amount)
     {
         this.item = item;
         this.amount = amount;
     }
 }
 

and this should be the last relevant one

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 [System.Serializable]
 public class Item
 {
     public string name;
     public Sprite image;
 }
 

Thank You,