Hi, if your animations are the old MV animation style, then yes because those are just images, you should be able to set those images to preload the same way you would with any other image.
If your animations are Effekseer then I do not think so as those are 3d models, though you could probably preload the texture images the entire thing would not be preloaded. I can look into allowing preloading of those in a future update.