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Rowtime for Table from DataStream without explixit fieldnames


when converting a DataStream (with Watermarks) to a table like described here

I wonder on how to use the rowtime in a following window operation _without_ explicitly specifying all field names and hence rely on case class type inference.

Currently when operating on a stream of events 

case class Event(field1: String, ts: long)

val ds: DataStream[Event] = ...

I have to do 

tableEnv.fromDataStream(ds, 'field1, 'ts, 'myRowtime.rowtime) 

to do

.window(Tumble over 1.hours on 'myRowtime  as 'w)

afterwards. Is there a way to create the TimeAttribute column without specifiying all fields again?

Thanks for yout help,