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A cloudflade record needs your site’s IPv4 to transfer a domain.
I’m not really sure what you’re asking. If you’re trying to connect your site to Cloudflare, you can locate the appropriate IP address to set up an A record in your client area.
If you look on this page, right in the middle of your screen should be big validation cards that tell you whether you have setup nameserver validation or CNAME validation. You need to complete either of those two validation to be able to add your domain name.
Validating your domain name with an A record is not possible. And even if it was, we wouldn’t be able to validate it with Cloudflare’s proxy enabled.