Render JSON issue

[Jmeter Tea]

About Render JSON option in View Results Tree,
RenderAsJSON have TAB_SEPARATOR = ":   " This means that when rendering
JSON it creates an invalid JSON with `:` characters

{   "code":"1", "message":"Not found" }

Will be render as

{:   "code":"1",:   "message":"Not found"}

Is there a reason for `:` characters or can it be removed to create a valid
JSON?
Actually what's the purpose of JSON render? If the response is JSON it'll
be displayed as JSON

Thank you