JSFiddle - React, Tailwind, and code Playground

HTML

<form class="variations_form cart" method="post" enctype="multipart/form-data" data-product_id="9" data-product_variations='
[{
    "variation_id": "18",
        "variation_is_visible": true,
        "is_purchasable": true,
        "attributes": {
        "attribute_pa_size": "a3"
    },
        "image_src": "",
        "image_link": "",
        "image_title": "",
        "image_alt": "",
        "price_html": "<span class=\"price\"><span class=\"amount\">£19.20<\/span><\/span>",
        "availability_html": "",
        "sku": "100",
        "weight": " kg",
        "dimensions": "",
        "min_qty": 1,
        "max_qty": 0,
        "backorders_allowed": false,
        "is_in_stock": true,
        "is_downloadable": false,
        "is_virtual": false,
        "is_sold_individually": "no"
}, {
    "variation_id": "22",
        "variation_is_visible": true,
        "is_purchasable": true,
        "attributes": {
        "attribute_pa_size": "a5"
    },
        "image_src": "",
        "image_link": "",
        "image_title": "",
        "image_alt": "",
        "price_html": "<span class=\"price\"><span class=\"amount\">£8.75<\/span><\/span>",
        "availability_html": "",
        "sku": "100",
        "weight": " kg",
        "dimensions": "",
        "min_qty": 1,
        "max_qty": 0,
        "backorders_allowed": false,
        "is_in_stock": true,
        "is_downloadable": false,
        "is_virtual": false,
        "is_sold_individually": "no"
}, {
    "variation_id": "19",
        "variation_is_visible": true,
        "is_purchasable": true,
        "attributes": {
        "attribute_pa_size": "a4"
    },
        "image_src": "",
        "image_link": "",
        "image_title": "",
        "image_alt": "",
        "price_html": "<span class=\"price\"><span class=\"amount\">£13.50<\/span><\/span>",
        "availability_html": "",
        "sku": "100",
        "weight": " kg",
        "dimensions": "",
        "min_qty": 1,
        "max_qty": 0,
       ...

JavaScript

json = $("form.variations_form").data("product_variations");

$.each(json, function(key, pre_product) {

	alert(pre_product['variation_description']);
	alert(pre_product['variation_description']);
  
});