Head

You can specify a bone to be marked as head and rotate automatically when the base entity AI rotates its head.

Setup

Configure the head bone

Open your .iaentitymodel model file with Blockbench.

Select the base bone of the head.

Rightclick on the bone and select "Bone Config"

Check the "Head" option and press "Confirm". You can also decide max angles for X and Y rotation.

The head bone is now marked as head, as you can see (the smiley face is the head bone).

Done

Now you have to export the model as usual.