Make a subdomain of wordpress site to cloudflare

Good day
I have a server connected to Cloudflare with that server IP and there is no problem at all with that. The thing is that I recently created a wordpress blog, which I would like to add to Cloudflare as a subdomain of my servers domain, I can’t add the IP of my wordpress blog, because it changes constantly, I only have the url of it. How can I link it to cloudflare so that it could appear as instead of

Try this:

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