Add additional field in Packing Slip Item fetch from sales order

Hello, I wanted to add the custom field in the Packing Slip Item. Can someone please guide me on how to do it?

frappe.ui.form.on("Packing Slip Item", "item_code", function(frm, cdt, cdn) {
var d = locals[cdt][cdn];
    frappe.db.get_value("item_code", {"name": d.item_code}, "customer_item_code", function(value) {
        d.customer_item_code = value.customer_item_code;


Doctype = Sales Order Item
Sales Order Item Field Name= customer_item_code
I wanted to add the customer_item_code in the Packing Slip Item table.