How to return the data of another model instance model by using joins in laravel?

I want to return the data of Charge instance instead of User , for that i am trying to use joins ,can you please help me to acheive this thing

  $id=Charge::whereNotNull('created_by')->get('created_by')->toArray();
        foreach($id as $name){
            $id[] = $name['created_by'];
        }
        return $v=User::whereIn('id',$id)->where('username',$request->data)->get();
        }

for this i am trying to use left join , relationship available between created_by and id (I am trying to convert above queries into single query)

$v=Charge::whereNotNull('created_by')->leftJoin('User',function($join){
            $join->on('Charge.created_by','=','User.id');
        })->get();