JSON escape support

Howdy! I have a web request that I’d like to include prompted content in, but it needs to be a valid JSON string. This is kind of annoying, because it means that the input cannot use things like quotation marks. It’d be awesome if Yaak had a function built into it for escaping strings for the purpose of JSON.

Just to make sure the usage is obvious: I have a request that’s body is something like this:

{
  "field": "// contents go here"
}

I’d like it to just be

{
  "field": "${[ prompt.text() ]}"
}

But unfortunately it can’t be, because the prompt input could be invalid JSON. As an example, the text ”Hello world” is obvious invalid JSON.