@james @fbartels Correct, this is just for pre-populating and updating the values in Cloudron > Network > Configure Trusted IPs & Ranges, when "Enable proxying for new DNS records" is ticked on any app.
If you are using Cloudflare Proxying, you are implying you trust Cloudflare IPs to relay traffic.
The Nextcloud WOPI setting, although I think it could be pre-populated, is easier to do from following the documentation, if there's any concern why you wouldn't want that internal IP address pre-populated. Although, I can't think of why you would be concerned with an internal IP address being pre-populated in Nextcloud.