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Yii2 sets array shape field as required in model

If I have the following form field (code below), how can I set the field as required in my model so that like other fields, the form cannot be submitted without it containing information.

<?= $form->field($model, 'seo[seo_title]')->textInput(['maxlength' => 60])->label('SEO Title') ?>
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for text input in options, for example:

 <?= $form->field($model, 'seo[seo_title]')->textInput(['maxlength' => 60], 'value'=> $yourValue )->label('SEO Title') ?>


or if you only want these fields, the required labels required in the model

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