Shopify PO Field Pass To Helm

We have a Shopify platform for our trade customers. When our customers place an order via Shopify, there is a purchase order field that our customers complete. Our customers use this to keep track of their orders. Unfortunately, the field doesn't pull through to Helm. We like to write the PO on the customer's order and packaging so they know which order has been delivered. Goals: We're trying to achieve a better all-around customer experience and increase efficiency for our customers. Examples Purchase orders are used as references