AFAIK, not in the three.js
repository. But the Blender exporter should be able to export both morph target and skeleton animations.
Are you updating the size based on the current dimensions of the model? That means you perform the vertex transformations based on the skeleton/bones in JavaScript per frame and then calculate the current AABB. If so, it would be great if you can share your code as a live example or PR. Some users lately asked for such a functionality. Read the following topic for more informations.