No Problem.
https://sysupgrade.openwrt.org/
auc = Attended sysUpgrade CLI
and there is also a luci app.
Attended Sysupgrade is a server where you can generate openwrt images with all your needed (allready installed) packages and easily upgrade to a newer release (and also keep your config).
There are a lot of examples in the docs. A lot of discussion in the forum.