How do I change on Etsy the Dimensions to Show as A0-A5

Hi. Using Print Shrimp to give a go with digital art prints but on my etsy listing the art is showing to choose each width and heigh measurement rather than choosing the A0-A5 Sizes. Bit confused in how to change as the only width and height variations I get are mm, cm, inches, metres, yards and feet.

Hopefully someone gets what I mean and can help. Would highly appreciate it.

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