[feedback]: Use environment variables inside Body JSON

[MateoCerquetella]

What would you like to tell us?

Many developers have different ways/styles to pass fields into an endpoint, In my case for example, When I have a auth endpoint I like to send the JSON body filled with the "email" and "password", but I don't want to use the same user for every instance of a environment, so it would be nice to implement the usage of the environment inside the Body of an endpoint.