How to use newpage in wbs diagram?

Question

I want to use the preprocessor to generate multiple WBS diagrams from json data. The newpage keyword doesn't work. Is it possible to do this with another approach?

@startwbs
!procedure $make_wbs($parameter)
' read json data here and make a wbs diagram based on parameter
!endprocedure

$make_wbs($parameter="X")
newpage
$make_wbs($parameter="Y")
@endwbs

Both diagrams are based on the same json data but use different "parts" of it. The "parameter" is used to select the relevant "part". 

Comments

Not ideal, but a possible work-around is to use a deployment diagram instead (where newpage does work), and include the wbs diagrams inside labels.
(click for source)