外部在laravel模型调用中应用

Question

使用php laravel选择数据，如何在laravel代码中添加外层应用？

    $data_result = tableA_model::where(function($query) use ($input) {
      $query->where('city', '=',  $input['city'] );
    }

我需要像这样的sql

select *, (select top 1 name from imglist where id=tableA.id order by cover desc) as picname FROM tableA where ...

或

select * from tableA outer apply (select top 1 name as picname from imglist where id=tableA.id order by cover desc) img where ....

我如何在laravel中获得这样的外部应用？