How to export python-generated animation to alembic?

Hey guys. I've made an animation using script by changing the target mesh's vertices' coordinates frame by frame via “bpy.app.handlers.frame_change_pre.append(myfunction)”.

So, i click the play button, this anmiation works fine. Now I wanna export it to alembic because i wanna use this animation in other software. But the exported alembic gives me a static mesh, there's no animation at all.

How can I solve this? Appreciate it.