Global DNS with Cloudflare - how to set other IP adress for dns records?

Hi,
I am using Cloudflare in Rancher as Global DNS Provider. But because I am using an external redundant NGINX Load Balancer with an FailOver IP, I want to use this IP adress in the DNS records.

But I don’t know what annotation I have to set in the Ingress, to define this IP adress.
It is realy annoying because I always have to log into cloudflare to change the IP, after rancher creates the DNS entrie.

I already tried:
io.rancher.host.external_dns_ip
but it does not work.

Has anyone an idea what the correct annotation is?
Thanks.

I realy don’t know what’s the correct way to change this. Any idea?