如何在AMP-html中将数字格式化为货币？

<script async src="https://cdn.ampproject.org/v0/amp-bind-0.1.js"></script>

<amp-state id="amount">
  <script type="application/json">
    {
      "value": 1234.56
    }
  </script>
</amp-state>

<amp-bind-macro id="formatCurrency" arguments="amount">
  <script type="application/json">
    "return '$' + amount.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');"
  </script>
</amp-bind-macro>

<p>Formatted amount: <span [text]="formatCurrency(amount.value)"></span></p>