For those wondering how this whole Damian and Raven thing all started and eventually became canon. This is who you need to thank for making it happen in the movies. So if you get the chance to go to twitter and show your support for this person and just thank them for making it happen.

So there you go. That's how it all happened. It was also the fans that made it happen in this universe. So you all played a big part in it making it canon. Anyways, I just wanted to bring this to all of your attention. I thought it was something that was worth mentioning. So if you get the chance go and say thank you to them.