I think you should feel safe that unreal will provide you with what you want, eventually. Right now it doesn’t seem that those functions are in there. But I don’t think it will be too hard to implement. PaperFlipbookComponent has a variable called CachedFrameIndex which is an int which is frame that is currently playing; When game updates (yes wth deltaTime), flipbookComponent track how much time has passed and works out which frame it should be playing at that moment.
A lot of what you want could be done and I’m sure has some things coming.