Same with ESRB
ESRB EC
ESRB E
ESRB E10+
ESRB KA
ESRB T
so on...
... those are already on the site. We have ESRB, PEGI, ESLPA and VRC.
One of the reasons why we still haven't added these is that we need a guide for people to distinguish the ratings themselves. I keep rejecting BBFC ratings because people keep confusing them with ELSPA, for example. I've also had a hard time finding images to help people distinguish between them all.