How can I add additional cost for each product added on shipping profile like ebay?

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I have created a shipping profile on our shopify website. For Standard Delivery to UK from Japan it is Free especially when the weight is between 0 to 50 grams. But for Express Delivery to UK from Japan, I will add an additional £19.85 cost and also add £2.85 for each additional product added.


Note: I know how to set a rule for products that weigh between 0 to 50 grams for Express Delivery through shipping profile.


Problem: How can I implement to add £2.85 for each additional product added through shipping profile or any settings?


In ebay, this is possible through creating a business policy.


Do you know how can I implement an additional cost for each item through shipping profile or custom settings? Any help is greatly appreciated. Thank you.