List of categories of products with the respective quantity of products associated in Laravel 5

I would like to have a list of categories of products with the respective quantity of products associated to them (categories) in laravel 5 like this:

electronics (20) items, cell phones (100) items

expected JSON format:

{ "name": "electronic", "quantity": "20" }, { "name": "cell phones", "quantity": "100" },

Anyone have an idea how to implement this in laravel 5?

via Chebli Mohamed