If I’m understanding this help page about Feeds, there should automatically be a JSON feed for every category, but I’m not seeing that. I only get 404/Not Found responses.
In particular I want to use the feed https://marygrayson.net/categories/txt/feed.json
(corresponding to Mary Grayson - txt).
Note that the corresponding XML feed is there and looks okay. But crossposts to Bluesky are missing included images, and I saw a reply on here somewhere that JSON feed worked better for that than XML. Feedback on that assertion is also welcome!