The first thing that came to my mind as soon as I self-learnt Unity editor scripting for utilities and tools, was to try and make a simple JSON editor within Unity. After a lot of hair pulling and almost giving up due certain nested array issues, I finally got the tool going with some basic functionalities.

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The tool can be found on Unity Asset Store for a nominal price: JSON Creator. This include saving and loading JSON sheets, but you can also check out a free version on my GitHub: JSON Creator Free