If I create a study and set "Analysis mode" to "Interactive lesson" I'm able to add comments for particular moves in .pgn, this is OK. But I can add "When any other wrong move is played:" messages and "Optional, on-demand hint for the player:" info also. But these are missing from exported .pgn files!
Indeed. PGN was not designed for that.
PGN was not designed for circles and arrows also, but those are saved in comments using [%cal ...] and [%csl...] inside {}. May I suggest to do the same using something like [%fail...] and [%hint...]? This would be useful to lecture authors if they want to save/archive they work or just want to work on it offline because for example they want to search and replace something in many chapters, etc-etc.
That requires importing them as well.
Of course! This way content authors can export/import exactly the same whole content they created.
Other infos not saved to .pgn are chapter meta data. Orientation, Analysis mode, Chapter pinned comment. The first two are good candidates for being pgn header tags while pinned comment should be saved something like [%pinned...] comment similar to my prev suggestion.
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Of course! This way content authors can export/import exactly the same whole content they created.