Read (org) var for the capabilities. As far as I know, you can't reference a src block without run it, but you can reference a literal example, for example, you have put your json data into an EXAMPLE block
#+NAME: json_data
#+BEGIN_EXAMPLE
{
"method": "+",
"params": [1, 2, 3]
}
#+END_EXAMPLE
then you can reference the json data via its NAME
#+BEGIN_SRC sh :var x=json_data
echo $x | jq .method
#+END_SRC
#+RESULTS:
: +
here is another use
#+BEGIN_SRC emacs-lisp :var x=json_data
(let-alist (let ((json-array-type 'list))
(json-read-from-string x))
(apply (intern .method) .params))
#+END_SRC
#+RESULTS:
: 6