in JSS we have a possibility to return flat model of data. For this purposes we have to get all members recursively and define fields needed with corresponding properties. As it is described in:
http://jasperreports.sourceforge.net/sample.reference/jsonqldatasource/index.html#jsonql
Unfortunately we unable to return this kind of metadata on JRS side using jsonQL datasource.
Implementation of mechanism for such functionality or workaround if it is possible needed.
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