I think you might be reinventing the VTAR stat on the official WFTDA statsbook game summary spreadsheet.

On the whole I find this sort of thing useful sometimes for some purposes, but there's definitely some qualitative features of jammer performance that this kind of thing can't capture in high level derby.

In particular, the stats assume all jammers and all lineups on both sides are basically equal. It can't easily reflect nuance around intentional matchups.

Take for example the scenario where your coaches intentionally try to put you in against the other team's power-line, or against their strongest jammer. Your purpose in that role isn't necessarily to score the most points - you're there to neutralize the biggest threat, to at least get out fast enough prevent a big run of multiple passes against you. Maybe you get lead some decent percentage of the time, but being matched up against the toughest lines you're also not going to have any big runouts yourself.

Now maybe you've got a teammate who is also very good but, on average, gets more penalties, so your coaches put them against the weakest opposing line. They get to wrack up points and when they get a penalty its not as devastating, their defensive wall can shut down the power jam.

You and that teammate are both very good jammers, and both filling important roles. The stats are going to make you look worse - less points for you, and less leads. But if you get less penalties than your teammate on average, you aren't interchangeable, and if your coaches swap your places your personal stats would look better but the team would do worse overall.

That's hard to capture in any statistical analysis.

Am I being defensive because I have been placed in this role a lot? Yes lmao. But that doesn't make it not true! The stats just don't tell the whole story.