Meanwhile I looked at several feeds to find out how other podcasts provide keywords.
The key is that they provide an <itunes:keywords> tag which contains a comma separated list of keywords. These keywords then appear on the podcast portals (e.g. https://player.fm, podcast.de).
Unfortunately, a search within this panel reveals that exactly this feature was removed in 2.4.0 (see Release 2.4.0).
Is it possible to discuss this again?
IMO keywords are essential for a podcast to be found by listeners.
Regards,
Bernhard