Create FAQ google rich content with js

<script>
//prwtes dyo erotisis
var question1Title = document.querySelectorAll("h2")[0].innerText;
var question1Answer = document.querySelectorAll("h2")[0].nextElementSibling.innerText;
var question2Title = document.querySelectorAll("h2")[1].innerText;
var question2Answer = document.querySelectorAll("h2")[1].nextElementSibling.innerText;

//dimiourgia tou javascript tag
var scriptTag = document.createElement("script");
scriptTag.type = "application/ld+json";

//periexomeno tou javascript tag
scriptTag.textContent = JSON.stringify({
    "@context": "https://schema.org",
    "@type": "FAQPage",
    "mainEntity": [
      {
        "@type": "Question",
        "name": question1Title,
        "acceptedAnswer": {
          "@type": "Answer",
          "text": question1Answer
        }
      },
      {
        "@type": "Question",
        "name": question2Title,
        "acceptedAnswer": {
          "@type": "Answer",
          "text": question2Answer
        }
      }
    ]
  });

//prosthiki tou script element sto kefali
document.head.appendChild(scriptTag);
</script>