help with dynamic inputs in laravel 5.5

$(document).ready(function(){$(".alergia-boton").click(function(){
  if($("#id_alergia_paciente").val().length <= 1){
    return false
  }
  else{
    let valor = $("#id_alergia_paciente").val();
    let html = $('#formulario_registro').html();

    html+='<input type="text" name="alergia_paciente[]" value="${valor}">';

    $('#formulario_registro').html(html);

    $('#id_alergia_paciente').val("");
  }
});});

  

I have this script that generates dynamic input and I need to save it in a table that has fields id and allergies_patient, the values of the input would go in allergies_patient but when I save them in the controller with a for, it adds the id nothing else and it leaves me null the allergy_patient field that is to say that you are not collecting the data from the input.

this is the function that stores them in the controller:

DB::beginTransaction();
            try{

                    for($i=0;$i<=1;$i++){
                        $alergia = new Alergia;
                    $alergia->paciente_alergia_id = Auth::user()->id;
                    $alergia->alergia_paciente = $request->input('alergia_paciente['.$i.']');

                    $alergia->save();

                    }

            }catch(Exception $e){
            DB::rollback();      
            throw $e->getMessage();    
            return 'ERROR';

          }
          DB::commit();

          Sesion_usuario::Sesion_usuario();

          return 'EXITO';

Could you help me see why it does not save the values of the input?