JSON log format not working

[Aerijo]

The JSON log format sample doesn't appear to work.

Steps:

1. Copy provided example into file
2. Replace \r\n with actual carriage return and newlines
3. Upload log to viewer

Expected: It shows the two messages
Actual: It says "No Matching Message"

Similarly in VS Code (1.41.1) it wouldn't accept {"format": "JSON"} as a value for "css.trace.server", only "off", "messages", or "verbose". It seems as if JSON support has not been implemented yet, or that it was removed at some point.