Override laravel notification broadcasting event method broadcastWith

For laravel notifications it uses BroadcastNotificationCreated event that contains broadcastWith method that merges data that we chosed to within notification class that is created. (ex: php artisan make:notification Follow)

This is how this method works:

public function broadcastWith()
        return array_merge($this->data, [
            'id' => $this->notification->id,
            'type' => $this->broadcastType(),

How can I override this one? Or how can I specify custom event for notifications broadcasting system?