Is it possible to do one-way control for different layers using Platform Effector 2D

I have a "Player" layer and a "Companion" layer. I want the player able to jump up the platform, but the companion can't. But, the companion still collides with the platform.
The colliderMask simply disables the collider. This isn't what I want.

Is there anyway to do it?

There's no way I can find the open source of the Platform Effector 2D and add the layermask control myself.