GNOME has a feature for managing online accounts in one place ( GnomeOnlineAccounts | GOA).

In it’s current state Nextcloud is supported and it can read calendar, contacts and documents (as in providing a quick mount option in the file explorer): https://wiki.gnome.org/Projects/GnomeOnlineAccounts/Providers

This way account credentials can be shared and are configured and managed in one place where they can be requested by an application. The communication is done via D-Bus.

Currently I have to configure my accounts in two places, the nextcloud-client and in GOA, to get a Nextcloud server tightly integrated into my system and while the passwords end up in the same place (gnome-keyring) it’d be more user friendly to share this from a common ground instead of having to configure this twice for each Nextcloud account.