How to charge/authorize extra 5% or 10% of the product price to allow for weight differences

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Hello, I'd like to ask if we could charge or authorize an additional amount (percentage of product price) at the time of purchase? For businesses that sell fresh produce by weight, it is common that the actual weight of a product after packaging is slightly different (+/-) than the weight ordered. So having a small buffer of 5%-10% of the product price would allow adjusting for price after packaging of the product. Of course, it is not appropriate or feasible to contact every customer after purchase to resolve this. Is there a feature in Shopify or an app that could enable charging a slightly higher amount and mentioning the reason for doing so at the time of purchase?