I have an order table with products and order lines.

Select Orders.Id, Customer.Id 
from Orders
join Customer on Customer.Id = Orders.CustomerId
where Order.Id = 1 
for json auto

This could return

[{"Order": {"Id":1,
            "Customer": [{"Id": "10"}]
           }
}]

If I want to extend the json with the OrderLines like

Select Orders.Id, Customer.Id, OrderLines.Id
from Orders
join Customer on Customer.Id = Orders.CustomerId
join OrderLines on OrderLines.OrderId = Orders.Id
where Order.Id = 1 
for json auto

I get this result

[{"Order": {"Id":1,
            "Customer": [{"Id": "10",
                         "OrderLines": [{"Id":1},{"Id":2"}]
                       }]
           }
}]

{"Order": [{"Id":1,
            "Customer": {"Id": "10"},
            "OrderLines": [{"Id":1},{"Id":2"}]
           }] 

}

Is there an easy way to do this? Or is the only way to do this using string concatenation?

I know MS SQL has a solution for this. There it would look like:

select Orders.Id
      ,Customer.Id as 'Customer.Id'
      ,(select OrderLines.Id 
        from OrderLines 
        where OrderLines.OrderId = Orders.Id
        for json path) as 'OrderLines'
from Orders
join Customer on Customer.Id = Orders.CustomerId
join OrderLines on OrderLines.OrderId = Orders.Id
where Order.Id = 1 
for json path, root('Order')

Does anyone know whether SAP is working on something like this?