It is entirely possible to boost higher frequencies with Audyssey provided your equipment is capable of communicating with the phone app.
As an example, the curve editor could be set with a flat response to say 2k at -5dB and then 10k set to +10dB. That's at listening level of 0dB and at lower listening levels Fletcher Munson Curve compensation can be added by implementing Audyssey Dynamic EQ.
As an example, the curve editor could be set with a flat response to say 2k at -5dB and then 10k set to +10dB. That's at listening level of 0dB and at lower listening levels Fletcher Munson Curve compensation can be added by implementing Audyssey Dynamic EQ.