多个Laravel表单请求验证规则在单个文件中

I was wondering if anyone thought of a way to have multiple request rules inside a single file? Currently, I have some folders like reviews and posts where I have CRUD validation rules and many other form request files related to my models. However, I think having all validation rules inside a single PHP file like App\Http\Requests\Reviews would be excellent.

Not sure how I could I inject them in my controller methods like with regular laravel Form Requests.

Any ideas?