datalist.html

<input type="text" list="mysearch" name="search" placeholder="pesquise aqui...">
  <datalist id="mysearch">
    <option value="Luciano" data-id="1">
    <option value="Fernando" data-id="2">
    <option value="Paulo" data-id="3">
  </datalist>

  <script
  src="https://code.jquery.com/jquery-3.5.1.min.js"
  integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0="
  crossorigin="anonymous"></script>

  <script>
    $(function(){

      $('input[name=search]').change(function(){
       
        var inputValue = $(this).val();

        var optionSelected = $(`#mysearch option[value=${inputValue}]`)[0]

        if(optionSelected){
          console.log(optionSelected.dataset.id)
        }
      })


    })
  </script>