I thought I was doing it right- here's the file. https://drive.google.com/file/d/1-LS-mMnuAqgBuXCz6BQk8bXt8gZgItq8/view?usp=shari...
Nope, it's not a city json. It's an ImageMagick's json ("version": "ImageMagick 7.0.10-58..."), something like a description of an image (a city map I guess) with its dimensions and other stats.
