Need to calculate the total Material cost at the time of shipment planning

Summary:

We have a requirement where we notify the carriers on how much insurance is required based on the value of the shipment. We can pass the material cost from the ERP system to OTM, I see in OTM , on the item level we have a way to store the material cost /material overhead cost etc but not sure when shipment gets planned if there is a way we can sum up these costs and display it on the shipment. I was thinking about achieving this via agents and populating it in shipment info costs. Is there any better