Many of us ship Lithium batteries or other hazardous goods. We have to apply the appropriate UN label or other warning labels on the box.
Goflow should have this built in. Under a product, we should be able to enter what its shipping designation should be - for example, "UN3481". This could be under the "Customs & More" section.
When a shipper is packing an order containing said item, goflow will notify them to place the appropriate warning labels on the box.
Example mock-up below.