I also do not use Navigraph. I tested the ILS on runways 27R, 27C, 28C, 28L last night in the default Cessna 172 G1000 and none worked. The in game VFR map is missing ILS data when you select KORD.
Seems this issue isn’t getting any attention. O'Hare used to be among my favorite airports. Not fun flying in winter weather without ILS approaches.