DDNS and multiple hosts possible?

I'm using Cloudflare as my DNS provider and have DDNS working perfectly for one host. I've been using CNAME to "copy" that IP to multiple hosts for the domains, websites etc that we host on our company router.

Yesterday I played around with DDNS, and realised that I could have more than one service running using dns_cf which moves me closer to my goal of removing CNAMEs (I'm old school and believe all hosts should have a proper IP address).

I can create separate services for each host, but I was wondering if there is a way to update multiple hosts within one service. My reading of the docs suggests that this is possible, but if it is, I couldn't figure out how to update /etc/config/ddns.