How to use Epic as dimension for “Issues per Two Fields” diagram in Youtrack 6.5

Let me please copy reproduce my question from https://stackoverflow.com/questions/44209791/how-to-use-epic-as-dimension-for-issues-per-two-fields-diagram-in-youtrack-6-5  here:

I'm trying to build Issues per Two Fields diagram which should display how tickets are distributed over its states in every Epic. This thing is that Epics are defined in Youtrack via hierarchy relation "parent-child" and these relations cannot be used as fields in diagram settings. Will anybody kindly say if there is any official way to configure the diagram to use tickets' parents as dimension parameter for aggregation?

(P.S Just to clarify: first column of the diagram should be list of Epics)

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  Regards, Valentin