Strict hostname naming

[disputas]

Hello,
I’m using Cloudflare, but I don’t have an Enterprise plan, so I can’t add subdomains directly. I’m using the example.com zone, which is already added to the domain filter.

Problem:
I’m running external-dns on a staging cluster, and when using external-dns in load balancer annotations, I want to specify the staging subdomain (staging.example.com).

Is it possible to configure external-dns Helm values to strictly filter subdomains without relying on the domain filter?

I want to set up the domain example.com and configure external-dns to create records in Cloudflare only if the hostname in the annotation contains staging.example.com. It should only work if the annotation hostname follows the format .staging.example.com, and this should apply specifically to cases where annotations are used to define the external DNS hostname.

For example. Records should be setted:
process-one.staging.example.com
process-two.staging.example.com

Skipped on these:
process-one.production.example.com
process-two.something.example.com