Combine Fields Into Hidden - CF7

add_action('wp_head', function(){
    ?>
        <script type="text/javascript">
            document.addEventListener('DOMContentLoaded', function () {

              // Define an array of field Name
              var fieldNames = ['your-name', 'your-lastname'];

              var hiddenField = document.querySelector('input[name="upload-folder"]');

              fieldNames.forEach(function (fieldName) {
                var field = document.querySelector('input[name="' + fieldName + '"]');
                if( field ){
                    field.addEventListener('input', updateHiddenField);
                }
              });

              function updateHiddenField() {
                if (hiddenField) {
                  var combinedValue = fieldNames.map(function (fieldName) {
                    var field = document.querySelector('input[name="' + fieldName + '"]');
                    return field ? field.value : '';
                  }).join('-');
                  hiddenField.value = combinedValue;
                }
              }

            });
        </script>
    <?php
});