I just need to know.
It's 2023, it feels like it should be possible, but I cannot for the life of me find anything about this, or a solution, online. Straight up editing content.opf does nothing. Maybe I'm doing it wrong, though. But even if I update the meta data afterwards with KoboUtilities doesn't work.
For example:
<meta name="calibre:series" content="SERIES"/>
<meta name="calibre:series_index" content=""/>
Not even the series will appear by adding/editing in opf though, only when I send it to device through Calibre.
Idk my

-brain really would love a series tag without #.
Possible?
