Yii2：如何格式化ActiveField中的值？

On my form I have this:

echo $form->field($model, 'amount')->textInput();

If the value coming from the database is 42.5 I want to have it formatted with two decimals in the input field like this 42.50. How do I do that?

I don't find any info about formatting in ActiveField docs...

You could use formatter functionalities

$form->field($model, 'amount', 
     ['inputOptions' => ['value' => Yii::$app->formatter->asDecimal($model->amount)]])