is Image #2 an example of an "unreadable", JSON entry? Seems pretty readable to me.
But at far as editing goes: at some point, those who wish to use custom schemes, and embed formatted JSON data in metadata values might have to get their hands dirty and edit the opf file manually. Sigil's not going to provide a gui feature to be able to easily edit calibre's proprietary json format used to support custom columns, categories, and collections in calibre's library view.
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