Yes, it is indeed.
try this
- create file /etc/updater/conf.d/user.lua
- add in user.lua
Install("ntp-utils") - save file
- run from ssh cli
pkgupdate
Later on when you want install other packages just extend Install("ntp-utils", "package name") and run pkgupdate again. For removal just delete the package name from that file, save and pkgupdate again.
And if you want to uninstall packages that came pre-installed add e.g. Uninstall( "openssh-sftp-client", "openssh-sftp-server").