At present, you cant share championships so here is my attempt to help I got a bit bored so created a custom championship based on the BTCC 2021 season with support races. Although all tracks are not in-game I selected alternatives with a general feel of missing tracks and length. The information is in the attached excel file although you will have to create each car type as its own championship to run the whole season. Edit - file changed as outdated file was uploaded
