its definitely possible to do so, but to my knowledge this has not been done yet, as it takes a lot of work and scripting, and few people have the skills here to do so.
the closest maps to campaign missions are various survival maps and a prototype challenge map:
http://forums.faforever.com/forums//viewtopic.php?f=2&t=7250&p=72276&hilit=challenge+map#p72275theres nothing to stop anyone from making some, apart from the large ammount of work invovled in making any map, and an equally large ammount for scripting it.
afaik domino is making a tool to speed up this proccess, but i dont know what state it is in.