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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaBrailleLabel create</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var btn = document.createElement("button");
    btn.textContent = "4 out of 5 stars";
    document.body.insertBefore(btn, document.getElementById("out"));
    btn.ariaBrailleLabel = "****";
    document.getElementById("out").textContent = JSON.stringify({
      text: btn.textContent,
      ariaBrailleLabel: btn.ariaBrailleLabel,
      attr: btn.getAttribute("aria-braillelabel")
    }, null, 2);
  </script>
</body>
</html>

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Element.ariaBrailleLabel — create + set (Try It)