I don't think it's possible to get any of that because each scheme asks different levels of reading from the QB. For example, Kyle Shanahan is largely regarded as a great play designer where schematically he does a great job at making reads easy and fairly open. Some maybe more 'traditional' systems ask the QB to make many of the reads.
From as statistical side it's hard for a model to determine how much of read/recognition is the system and how much is the player.
Just as an example I'll use the Pats/Eagles Superbowl (just came in my pants). Brady passed for 505 yards with 3 TDs and 0 Ints. He was hitting guys that were 2+ yard open regularly. Conversely 'Big Dick' |Nick passed for 373 yards, 3 TDs and a pick. He was hitting players in tight windows in clutch moments (3rd and 4th down).
When you look back at a game like that, how can you accurately assess who was going through their progressions better or making better reads? Systematically Brady had many guys running wide open. He still executed, but the GOAT was on and his stat line shows it. Foles also made great reads, but had a smaller margin for error and ultimately made enough plays to help pull out the win.
In short, it's hard to do an apples-to-apples comparison in this area. Like mentioned by
@halftime the coaches know. My bet is Nagy has some added comfort with Foles because he and Pederson both come from the Andy Reid coaching tree, so fundamentally they have similar bases.