How to setup dynamic dns with cloudflare and ipv6

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With dynamic dns I have successfully setup cloudflare with ipv4. But now I would like to do the same with ipv6. But can't find a way to do this. I have created a dns record in cloudflare with a aaaa record dns only but in opnsense I have no clue what to do next.
Is there anybody who knows how to do this ?

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