Custom attributes on Yii CHtml::checkboxList

Is it possible to create custom HTML attributes on CHtml::checkboxList?

For example, I want to generate an input like this, adding the custom attribute "data-input-x":

<input class="customClass" id="Model_inputX_0" value="1" name="Model[relationX][]" type="checkbox" data-input-x="3">

I already tried using the code bellow, but it not worked:

echo $form->checkboxList($model, 'relationX', $dataList, array('class'=>'checkboxFase refeicaoFaseComum', 'data-input-x'=>3));