Feature Request: have at least 1 alias for the nextlcoud server (aka: same account but many different server urls)

Steps to reproduce

1. add an account
2. start sync/upload/download stuff
3. add another server dns or url to the nextcloud server
4. no place to add the new server url

Expected behaviour

Have the possibility to have many server url alias, example: https://internal-dns.mynextcloud.cloud and https://external-dns.mynextcloud.cloud...

Actual behaviour

No configuration

Reasoning or why should it be changed/implemented?

Due to the introduction of DNS over HTTPs/TLS into Apple/Android device is not possible (or very hard) to use an internal server dns into the private LAN, in order to redirect the nextcloud traffic directly through internal network instead of passing through internet...seems because Apple/Android uses their own (or others) secure dns servers if you internally have non secure dns.
Maybe using more than one server url alias is possible to apply a specific routing strategy for internal or external network or any...

Environment data

iOS version: iOS 14.4.2

Nextcloud iOS app version: 3.4.2.0

Server operating system: Debian/GNULinux

Web server: nginx

Database: postgreslq

PHP version: 7.3.27-1~deb10u1

Nextcloud version: 21.0.1

The issue names no files, tests, or entry points. Begin by locating the account configuration and server URL handling, then determine how aliases should affect routing and sync; done means one account can use multiple server URLs without disrupting existing sync, upload, or download behavior.