How to check tags uniqueness of tags using spatie/laravel-tags plugin

Using spatie/laravel-tags plugin (https://docs.spatie.be/laravel-tags/v2/basic-usage/using-tags) in my Laravel 5.7 app I make editor of tags, so that admin would be able to add tags , but I need to make validation on tags uniqueness.

but usual validation rules like

   'name' => [
        'required',
        'string',
        'max:255',
        Rule::unique(with(new Tag)->getTableName())->ignore($tag_id),
    ],
    'order_column'         => 'nullable|integer',

does not work here, as fields are in json format like

 {"en": "Drama"}

Could you, please, give a hint in which way this validation can be done?

Thanks!

via Chebli Mohamed