Require unit number on checkout? (Or check to state no unit number)

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Hi Shopify community,

Some customers forget to enter their unit number when checking out, and it's causing a lot of returns. Then they get upset that their product didn't arrive and we have to pay to ship the product to them again. I don't have the ability to modify checkout.liquid, is there an app that can require the customer to either enter a unit number or checkmark a box that says "I do not have a unit number" before they can proceed?