Print Designer , Custom Item Field

[htakawira]

I have a custom field in items doctype which i created. I am using Print Designer for Sales Invoices. I need to add the custom field on the list of items sold. I have tried to add the field in Print Designer by adding a new field and Enabling Jinja then inserting {{ frappe.db.get_value("Item", row.item_name, custom_hscode) }} but still got nothing