<?=$form->field($checklist, 'agreed')
->checkbox([
'label' => "Проконтролировал пункт: <b style=\"color:red\">".Yii::$app->user->identity->username."</b>",
'disabled' => false
]);
?>
<?=$form->field($checklist, 'agreed')
->checkbox([
'label' => "<b style=\"color:red\">".$form->field($checklist, 'chesk_user')->textInput()."</b>",
'labelOptions' => [
'style' => 'padding-left:20px;'
],
'disabled' => false
]);
?>