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You can use JavaScript to retrieve the value from local storage and add it as a hidden input value to your HTML form. Here's an example:

Assuming you have a key-value pair in local storage like this:

localStorage.setItem('myKey', 'myValue');

You can retrieve the value and add it as a hidden input to your form like this:

<form>
  <input type="hidden" id="myInput" name="myInput" value="">
  <!-- Other form inputs here -->
</form>

<script>
  // Get the value from local storage
  const myValue = localStorage.getItem('myKey');

  // Set the value of the hidden input
  const myInput = document.getElementById('myInput');
  myInput.value = myValue;
</script>

In this example, the value of the myInput hidden input will be set to the value of the myKey key in local storage. Make sure to update the id, name, and value attributes of the input element to match your specific use case.