altFormat not working in jQuery datepicker input field

i am using the lib https://jqueryui.com/datepicker/

I would like found the proprierty that send the value selected to Backend with american format.

Exemple:

JS

<script src="https://code.jquery.com/ui/1.14.0/jquery-ui.js"></script>
  <script>
    $( function() {
      $( "#datepicker" ).datepicker();
      $.datepicker.regional['pt-BR'] = {
        closeText: 'Fechar',
        prevText: 'Anterior',
        nextText: 'Próximo',
        currentText: 'Nyní',
        monthNames: ['Janeiro', 'Fevereiro', 'Março', 'Abril', 'Maio', 'Junho', 'Julho', 'Agosto','Setembro', 'Outubro', 'Novembro', 'Dezembro'],
        monthNamesShort: ['led', 'úno', 'bře', 'dub', 'kvě', 'čer', 'čvc', 'srp', 'zář', 'říj', 'lis', 'pro'],
        dayNames: ['Domingo','Segunda', 'Terça', 'Quarta', 'Quinta', 'Sexta', 'Sábado'],
        dayNamesShort: ['dom', 'seg', 'ter', 'qua', 'qui', 'sex', 'sab'],
        dayNamesMin: ['Dom', 'Seg', 'Ter', 'Qua', 'Qui', 'Sex', 'Sab'],
        weekHeader: 'Týd',
        dateFormat: 'dd/mm/yy',
        firstDay: 7,
        isRTL: false,
        showMonthAfterYear: false,
        yearSuffix: ''
      };
  
      $.datepicker.setDefaults($.datepicker.regional['pt-BR']);
    
    } );
  </script>

HTML

 Date: <input type="text" id="datepicker">

Alternanty, i am using the hack at onSelect function:

...

dateFormat: 'dd/mm/yy',  
onSelect: function(dateText) {
    // Converter a data para o formato que o backend espera
    var dateObject = $(this).datepicker('getDate');
    var backendFormat = $.datepicker.formatDate('yy-mm-dd', dateObject); 
    $("#datepickerHidden").val(backendFormat);
},
....

it force the creation of field input hidden

<input type="hidden" id="datepickerHidden">

Shall be that exists a propriety the solve it problem?

like:

...
dateFormat: 'dd/mm/yy',  
dateToBackendFormat: 'yy-mm-dd',
...

Without the creation of hidden field in form and a function?

Of the way sugery, its not works to me. Cause it is necessary the creation of hidden field in form as already tell. But very well

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