mj-carousel-icon.mjml

<mjml>
  <mj-body>
    <mj-section>
      <mj-column>
        <mj-carousel icon-width="22px" left-icon="https://mjml.io/assets/img/right-arrow.png" right-icon="https://mjml.io/assets/img/left-arrow.png">
          <mj-carousel-image rel="rel-value" src="https://www.mailjet.com/wp-content/uploads/2016/11/ecommerce-guide.jpg" />
          <mj-carousel-image src="https://www.mailjet.com/wp-content/uploads/2016/09/3@1x.png" thumbnails-src="https://www.mailjet.com/wp-content/uploads/2016/09/1@1x.png" title="some title" />
          <mj-carousel-image href="https://jolimail.io" target="_top" src="https://www.mailjet.com/wp-content/uploads/2016/09/1@1x.png" />
        </mj-carousel>
      </mj-column>
    </mj-section>
  </mj-body>
</mjml>