How to bake and export childof?

Hi, I have a character and a bow. I constrained the armature of the bow to the hand and then positioned it “to fit” the character’s hand position, afterwards it works as intended.

Now I need to export the character, tried to bake with “Pose -> Animation -> Bake Action” (bones as well as object). Animation clip is created (with just starting and ending key),but bow is not moving in exported file.

What am I missing?

Before exporting the file, you need to verify that the baking actually worked correctly by disabling the initial constraint, and using the baked action instead. When you do this, does the bow still move correctly?