I don't know anything about Android AOSP, so I found this clarification important:
This does not mean that Google is making Android a closed-source platform, but rather that the open-source aspect will only be released when a new branch is released to AOSP with those changes, including when new full versions or maintenance releases are finished.
It's been a while since that I set this up, so take this with a grain of salt. I have these two plugins installed:
I'm honestly not sure if I even need both - maybe the Chapter Segments Provider is unnecessary, even though it's official and newer. I don't understand exactly how it works from the docs.
However, Intro Skipper gives you a new scheduled task named "Detect and Analyze Media Segments". Use this to extract metadata about media segments from your library.
Now that the server knows about some media segments you need a client that can handle them. I've had success with the Android TV App (check the settings) and the Web interface should support them too.
I didn't need to configure anything aside from that, as far as I can remember.
The media segments feature has been released as of 10.10.0 and it still needs a plugin. Still feels a bit clunky but works already on my Android TV box. I guess there will be more polish in future versions, now that the groundwork is done.
No, it isn't.
EDIT: I quickly want to add that Jellyfin is still great software. Just please don't expose it to the public web, use a VPN (Wireguard, Tailscale, Nebula, ...) instead.