laravel chunk (help)

when i using postman get the result from chunk,but the result will return "true or false",how can i solve this?

enter image description here

here's my code

 public function downloadMemberInfo()
    {
       error_log('download');
       set_time_limit(240);
       $memberListsArray = [];
       $tag = [];
        $tag = Member::select('vipcode')->where('vipcode','!=','')
            ->chunk(3000,function($members) use($memberListsArray){
            foreach($members as $member){
                $memberListsArray[] = $member;
           }
           return  $memberListsArray;
       });
       return response()->json($tag);
    }

via Chebli Mohamed