laravel 5.1 concat multiple column from relationship with eagerloading

I would to CONCAT multiple column name(from different relations) using Model::with(relationships) way. How we can do that.

Level

id | name
1  | Admin

Permission

id | name
1  | All

User

id | level_id | permission_id | name 
1  | 1        | 1             | Bob Login 

I tried this way, but not working, I want this output Bob Login, Admin, All

User::with(['level','permission'])
   ->selectRaw("CONCATE (user.name, ', ', level.name,', ',permission.name) AS uname")
   ->list('uname','id')->all();

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this way is working, but I dont want this one

    DB::table('user AS u')
            ->join('level AS l','u.level_id','=','l.id')
            ->join('permission AS p','u.permission_id','=','p.id')
            ->selectRaw("CONCATE (user.name, ', ', level.name,', ',permission.name) AS uname")
            ->lists('uname','id');

via Chebli Mohamed