how to pass extra data to templates?

I can't find any options there
**vendor/hiqdev/hidev/src/handlers/TemplateHandler.php**
```php
    public function prepareData($data)
    {
        return array_merge([
            'app'     => Yii::$app,
            'config'  => Yii::$app, /// DEPRECATED
            'file'    => $data->file,
            'handler' => $this,
        ], parent::prepareData($data));
    }

```