thinkphp6 查询表达式问题

thinkphp6 如何用链式形式写出这种格式的查询
(a IN '1,2') AND (b='bb' OR c like '%cc%')

```php

$where['id']= ['in',[1,2]];
 $where['b'] = 'bb';
$where['c'] = ['like','%'.$cc.'%'];
        ->$where($where)->;

```

whereOr()

Db::table('think_user')
    ->where([
        ['a', 'in',[1,2]],
        ['b', 'bb'],
    ])
    ->whereOr('c','like','%cc%')
    ->select();