Show navigation badge in sub navigation with count of relationship

class Notes extends Page
{
    public static function getNavigationBadge(): string
    {
        $record = request('record');

        return Note::query()->where('server_id', $record->id)->count();
    }
}

class ServerResource extends Resource
{
    public static function getRecordSubNavigation(Page $page): array
    {
        $items = array_filter([
            // doing some logic with the $page->record 
        ]);

        return $page->generateNavigationItems($items);
    }
}