The problem you are having could be called a confusing result of featuritis. If all you want to do is represent json in an outline, you can just use @clean x.json.
@auto x.json or (alternatively) @auto-json x.txt creates a json representation of the outline, complete with a representation of gnx's, uA's, etc. To see this in action, create the original file with @auto x.json, write the external file, and take a look at the result.
HTH. Please feel free to ask more questions.
Edward