It seems there is no easy solution… so rclone.org or other 3rd party tools seem to be the preferred solution. Leaving the links here for anyone else looking for a solution:
- Nextcloud-client-cmd? -- does Nextcloud have/support a command line client for headless servers? - #10 by tallthom - no solution
- How to install nextcloudcmd - #5 by EV21 - no solution
- nextcloud-desktop-cmd depends on ~~ 315 MB of gui libraries. · Issue #1339 · nextcloud/desktop · GitHub - nextcloud-desktop-cmd requires 315mb dependencies
- Where to download just nextcloudcmd? · Issue #1203 · nextcloud/desktop · GitHub - Where to download just nextcloudcmd? --> We don’t distribute nextcloudcmd separated. Sure, it can be improved…