When you have an iPhone and its Apple Health App, you can add HEADPHONE ACCOMMODATIONS under settings and choose to use your audiogram. If you don’t have one already in your HEALTH App (from Mimi or another app), you are given the opportunity to manually enter your audiogram when using it with AirPods Max or Pro. This is the ONLY way to enter that info manually. Once entered, whenever HEADPHONE ACCOMMODATIONS is active, and right now it’s only available to AirPods Max and Pro, the iPhone will adjust the curve of the headphones to your loss. In my opinion it works PERFECTLY.
NOTE: The Health App in iOS is ONLY AVAILABLE TO IPHONE USERS THAT CAN RUN IOS 14.6 or later. Meaning it won’t work with an iPad or Mac. Of course, on the Mac you can set a curve in EQ Apple Music. Doesn’t help with video, though. On the iPhone, it works across the everything.