How to set the Bone Map from GDScript?

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Godot Version

Godot v4.3.rc3.mono - Linux Mint 22 (Wilma) - X11 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 4060 Ti (nvidia; 535.183.01) - AMD Ryzen 7 5700X 8-Core Processor (16 Threads)

Question

How do I set the Bone Map from a bone_map.tres via GDScript?

I want to do the equivilent of setting the retargetting of the bone map by loading the bone_map.tres file in the Advanced Import pane.

I have been all over the docs and just can’t find the answer.