only two additional campaign - Lost in Nightmares and Desperate Escapes.
#1: Lost in Nightmares set before Resident Evil 5, flashback about Chris and Jill went to Spencer Estate. then they met Spencer and Albert Wesker. they fought Wesker and Chris was about to die when Wesker tried to give a final blow but Jill sacrifice herself along with Wesker to save Chris by jumped out of the window. Chris assumed she and Wesker were dead.
the game was great tho, it has a "classic" feels to the gamers - it's dark, horror, and less ammo. also there's an Easter Egg allowing to trigger the camera to classic camera angles.
#2: Desperate Escape set after Jill was freed from being mind control. it's about Josh and Jill went through hellhole to help Chris and Sheva until at the end of Resident Evil 5 where Josh and Jill on a helicopter.
the game was more action-oriented, opposite to Lost in Nightmares.