Custom Menu Item for Animator Controller Editor?

Has anyone here ever added a custom menu item into the menu that pops up when you right click inside an Animator controller’s layer? Is that possible? The menu I’m referring to is shown in attachment.

I’m wanting to create a script that lets me easily add a non-empty blend tree with certain configs. If it’s not possible to do it here, I’ll make it add the blend tree to the base layer when right clicking on a Animator asset in the Inspector.

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I don’t think you can add context menu items to the animator window …