Fullfil multiple line items with different tracking numbers on one order

Shopify Partner
7 0 0

Suppose I have an order with two different line items and each one has a different tracking number. When I make a post to the  `/admin/api/2019-04/orders/{$orderId}/fulfillments.json`, I'm not able to link which tracking number belongs to which line_item. Is this possible? Has Shopify considered this scenario?


line_item  tracking_number

1223         skdldd

4556 .      fdfsdsads


the admin just shows the two tracking numbers not linking to the specific line_item even after specifying that on the payload being sent. This makes fulfillments hard to track.