Can Order get custom attributes from Checkout ?

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I create checkout using StoreFront API. When I create checkout, I need to store some of my own data to this checkout, then if checkout is completed, I want to get this additional data from Order

I have research StoreFront API and find out that I can store my additional data in customAttributes when create checkout, but I don't know if I can get this customAttributes in Order

How can I implement this ?