Sadly it doesn’t 🥲. Copying app data is the hardest part of the process without a system level backup like seedvault, neobackup or traditional google backup services.

Only if you’re currently running stock android.

NeoBackup is the only one I’ve run across that seems to really fill the role of backup and restore thoroughly. The trouble is, in order to work it needs root, so I’ve nw er actually been able to try it. Almost reason enough to root in my book 😅, I love a good back up system.

Seedvault is another fairly well developed option, but it needs to be hardcoded in to the OS by the ROM developer.

You’ll probably ly benefit from a series of different backup apps in combination. Here’s a few that I’ve used and benefitted from:

SMS import/export - backs up all SMS, MMS call logs and contacts. Does not backup RCS.

Applist backup - back up your installed app list. This includes data on where you installed the app from and where you can get it again along with other useful info. The apps still have to manually installed.

Aside from those two, most FOSS apps include a backup and restore function, such as: signal, neo launcher, fossify calendar, newpipe, metro (music player), aegis (2 factor), obtainium, etc…

I hope this helps. I tend to tinker and install various ROMs, so am well aquainted with the pain of setting up a fresh OS without a system wide backup program. Its not as bad as it seems though, and as long as you get your messages, contacts and call logs moved over it goes pretty smooth.

I do see a mention in that post about instead supporting the jellyfin client developers. They give this page as a reference for who to support based on which client you use.