At the moment, Intervals.icu provides a user Power Profile relative to other users with same sex and age.
A nice addition would be a comparison against world top riders, such as About | Power Speed Profile. They also provide workout test protocols to download.
They provide a power profile calculator on their website. I am not sure if the references (below) provide necessary information to incorporate the mathematical model in Intervals.icu.
- Van Bon M & Vroemen G. Power speed profile: Performance model for road cycling. Sportgericht, 2018;6:2-8
- Van Bon M & Vroemen G. Power speed profile: Performance model for road cycling. Sportgericht, 2018;6:8-15