Creating keyframe from IKshape controller to bones


Here is my question. I'm not a pro in animation and set up and in english , so I hope you will understand !

I've a character rigged with skin modifier. Bones are linked to ik controllers (splines).

The controllers have keyframe but the bones haven't.

My problem is that i need my bones to be keyframed because i have to export that.

Is there a script or another way for converting the ik controller animation in keyframe on the bones ?

Thank you for your answer.