CDN configuration with LetsEncrypt cert - how to setup CNAME?

Trying to setup Gcore CDN in front of fly.io with custom domain. My domain points to CDN via CNAME. CDN to fly goes via fixed IPv4.
Now adding a certificate (even if it was validated before) requires me to point the CNAME to fly. At this point I’m stuck since I have a double use of the CNAME.
Is there any way to validate that I own the domain apart from adding a CNAME?

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