this has transcriptions of most jewel cases:
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https://vgcollect.com/item/8270
and this can be handy to find the images of the actual case
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dreamcast box art airforce delta
Then checking the length of the text and just manually editing down to ~250 characters with a hard MAX of 285, less is fine.
Theres no necessarily right or wrong, just a decent synopsis or some taglines about the game.
Same goes for genre, just use your best judgement and dont fret about it.