I like the idea, but I don't believe it is likely, that a large majority of teams would ever use it. If it is just a format.
I believe the only way you could ever have this be a success you would need to develop a complete, easily customizable, but still universal, tool chain. I think a CSV file(s) would be one of the best ways to do that.
If you are serious about this you should start a
SourceForge project.