How to get information from JSON dictionary?

Question

Node.js

I have a telegram json array of buttons.

[
  [
    {
      "text": "F",
      "callback_data": "{\"type\":\"new-btn\",\"owner_id\":33,\"product_id\":\"mdgnwmavm\"}"
    }
  ],
  [
    {
      "text": "G",
      "callback_data": "{\"type\":\"new-btn\",\"owner_id\":11,\"product_id\":\"lgds35fjh\"}"
    }
  ]
]

How to take callback_data.product_id from a certain object?
node-telegram-bot-api library