*lexscratch*.el

(defun nic-dyn-lookup (symbol)
  (format "%S" (symbol-value (intern symbol))))

(defun nic-lex-lookup (symbol environment)
  (let ((value (assq (intern symbol) (cadr environment))))
    (when (consp value) (format "%S" (cdr value)))))

(defmacro s-lex-format (template)
  (if lexical-binding
      `(let ((lex-env (lambda nil nil)))
         (s-format ,template 'nic-lex-lookup lex-env))
      ;; else it's normal binding
      `(s-format ,template 'nic-dyn-lookup)))

(let ((v 10))
  (s-lex-format "${v}"))