YAML user preference to Manage environment

Since JSON is strict & it doesn't allow comments, YML is a much better option for configuring environments.

If maintaining the underlying JSON structure gets difficult for parsing, another suggestion is to store as JSON only, but render as YML based on user preference. If user chooses to have YAML editor, you can provide a button to save (which can convert to json on click) to reduce the complexity over dynamic save activity also.