In the latest version you can call GetConsoleVariableIntValue() or GetConsoleVariableFloatValue() in blueprint to get console variables. Just be careful not to call this too often since it’s expensive to do cvar lookups every frame, for example. You’ll get warnings in the log if that happens.
I’m still trying to figure out a more direct access approach so it doesn’t have to do a lookup. Probably have to make something custom for that.