Adding new attribute inside ajax load select2

[RamiRayya]

                <?= $form->field($detail, "[{$i}]product_id")->widget(Select2::classname(), [
                      'initValueText' =>  $productDesc, // set the initial
                      'options' => ['placeholder' => 'Search for a Salesman ...' , 'id' => 'sem'],
                      'pluginOptions' => [
                          'allowClear' => true,
                          'minimumInputLength' => 3,
                          'language' => [
                              'errorLoading' => new JsExpression("function () { return 'Waiting for results...'; }"),
                          ],
                          'ajax' => [
                              'url' => $productUrl,
                              'dataType' => 'json',
                              'data' => new JsExpression('function(params) { return {q:params.term}; }'),
                          ],
                          'escapeMarkup' => new JsExpression('function (markup) { return markup; }'),
                          'templateResult' => new JsExpression('function(product) { return product.text; }'),
                          'templateSelection' => new JsExpression('function (product) { return product.text; }'),
                      ],
                    ]);
                ?>

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