This was the approach of my company ("games" that are secretly educational). Even Maxis itself actually failed, they went bankrupt and EA bought them and ditch

This was the approach of my company ("games" that are secretly educational). Even Maxis itself actually failed, they went bankrupt and EA bought them and ditched their educational games (what remained of Maxis started to just pump out The Sims series one after the other). But unless you are aiming at a really, really wide market, and is either lucky or get exposure help, you won't go far. I noticed for example "Kingdom Come: Deliverance" has a LOT of information about medieval era in the Holy Roman Empire, still they aimed to be a "AAA" game, and the information is tucked inside the in-game manual.