And how can that S-EXP control structure be usable in all other scripting language beside Lisp? If you can answer this question then you have already answered

And how can that S-EXP control structure be usable in all other scripting language beside Lisp? If you can answer this question then you have already answered your own question. But if your answer is "I don't have to because I use Lisp and I don't use other languages" then you miss the point of JSON.