MJML Preset

<link href="path/to/grapes.min.css" rel="stylesheet"/>
<script src="path/to/grapes.min.js"></script>
<script src="path/to/grapesjs-mjml.min.js"></script>

<div id="gjs">
  <mjml>
    <mj-body>
      <!-- Your MJML body here -->
      <mj-section>
        <mj-column>
          <mj-text>My Company</mj-text>
        </mj-column>
      </mj-section>
    </mj-body>
  </mjml>
</div>

<script type="text/javascript">
  var editor = grapesjs.init({
      fromElement: 1,
      container : '#gjs',
      plugins: ['grapesjs-mjml'],
      pluginsOpts: {
        'grapesjs-mjml': {/* ...options */}
      }
  });
</script>