Hello wplms

I am trying to distribute a pwa app.
And the documentation instructed me to insert the code below into the head. Where can I insert the code below?

<link rel="manifest" href="manifest.json" />

<script type="module">
   import 'https://cdn.jsdelivr.net/npm/@pwabuilder/pwaupdate';
   const el = document.createElement('pwa-update');
   document.body.appendChild(el);
</script>