In a nutshell: no, it is not possible.
ExtractWithNotes is an OnDemand call. It is not possible to set the number of decimal places in an OnDemand call. It is possible to set it in a template used in a scheduled extraction, but that is a different workflow.
Consideringt the use case you mention, I guess the easiest would be for you to apply the rounding programmatically to the results you receive.
For more information see this thread.