Here is a modification of the default signup form with code for analytics.

<head>
  <!-- Add the Google Analytics tracking code here -->
  <script async src="https://www.googletagmanager.com/gtag/js?id=GA_MEASUREMENT_ID"></script>
  <script>
    window.dataLayer = window.dataLayer || [];
    function gtag(){dataLayer.push(arguments);}
    gtag('js', new Date());
    gtag('config', 'GA_MEASUREMENT_ID');
  </script>
</head>
  
<script type="module">
    import { initializeApp } from "https://www.gstatic.com/firebasejs/9.14.0/firebase-app.js";
    import { getStorage, ref, uploadString } from "https://email-1.zymono.repl.co/1.0/storageapi.js"; 
</script>

<form id="cmForm">
  <input placeholder="Please Enter Your Email" id="codemail-email" type="email" required><br>
  <input type="submit" value="Subscribe"><br><br>
  This email signup form was created with Zymono Codemail and the Zymono <a href="//zymono.com/policy/privacy.html">Privacy Policy</a> and <a href="//zymono.com/policy/terms.html">Terms of Service</a> apply.
</form>

<script type="module">
  import { subscribe, saveCloud } from  "https://codemail.zymono.com/1.0/mail.js"
  window.addEventListener("load", function() {
    document.getElementById('cmForm').addEventListener("submit", function(event) {
      event.preventDefault()
      gtag('event', 'subscribe', {
          'event_category': 'Codemail List',
          'event_label': 'FORM_NAME',
          'value': 1
        });
  
      subscribe('Token', 'FORM_NAME', 'REDIRECT_URL')
    })
  })
</script>

You can create a Google Analytics account and measurement ID at https://analytics.google.com

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