Does this already exist? Will there be the ability to share custom Championships along with livery sets and custom ai drivers?
Yes!! And then it would be nice to change just the car and do the whole championshipe again. Now it costs me a lot of time to choose all the 25 tracks to have a real championship.
While it's currently not possible to share via file, at least you can hit the ground running by taking a look at the suggestions here: Championship Ideas and Suggestions