If you don't get an answer it probably means that no one knows of any existing mod.
I actually started on this mod a while back - it's not too complicated because php has built-in functions to read the data, it's just a matter of figuring out when to read and store it and where to display it. The functions to read the data are slow so I don't think it's practical to read it every time it's displayed, so I was going to make a place in the database for it.
Anyway, if anyone is interested in this I could let you have the little bit that I did get done, or else maybe I'll get back to it eventually.
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