How do I add a new animation to FE4?

Hi. I’m in the process of making a rebalance of FE4.
One of the changes I want to implement is to give heroes and dragon riders/knight/lords axes.

Now, giving those classes an axe weapon rank is easy, as is pointing them to use the sword animations for melee axes. The problem is with throwing axes, since there simply aren’t any suitable animations in the game itself.

Scavenging on the web, I found some animations. They seem to come in .bin files.
However, I have absolutely no idea on how to add them to the game.
Is there anyone able to help me?

Here’s one folder as an example of what I’m talking about.