[Question] How to determine Creature HP mode LFR / HEROIC / FLEXI

Hello there fellow devs,
we are currently working on our wowhead type page for 5.4.8. Is there any way to find out npc stats for different difficulties? Official wowhead have only 6.0.3 squished sttats. We do have all stats for normal modes, but none for other. Any help is more than welcome.

Thanks in advance