2D animation software compatible with UE4?

Mods, I apologize if this isn’t the right place to ask the question.

Which in itself is, is there any software out there for 2D animation that has a UE4 plugin/runtime/compatibility?

Also related is, how would I be able to use Inverse Kinematics for paper2D without a proper software supporting that feature?

I’m interested in using UE4 to build powerful 2D games but I’m struggling to find information about properly animating things for UE4 that can possess features such as IK.

Any help would be appreciated.