Variable propagation in same query block

Users Dgraph
,
2

Something like this?

{
  invoices(func: type(invoice), first: 5000) @cascade {
    purchase_orders {
      workflows: ~purchase_orders @filter(type(workflow)) {
        regions { reg as uid }
        locations {
          regions @filter(uid(reg))
          location_uid: uid
          location: location.name
        }
      }
    }
  }
}