Metahuman - breathing animation / rig (?)

Development Character & Animation
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1

I need to create realistic breathing animation.

AFAIK:

I need to add custom bone to rig and animate breathing…

But…

Body and Head are separate meshes with separate skeletons.

How do I connect them to have same bone under “spine_5” and connected weights and control rig for both?

It is kind of complicated right now since it is exactly on the edge of head and body mesh, where you have same but separated bones on both meshes.

Or is there some way to effectively do it at this moment?

Is breathing animation / rig something that Epic will add in future versions?

(In case there really is no current option?)

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Simply put, breathing is not realistic.
Wearing a magnetic sensor mocap suit and filming you are 100% unable to see even when the actor is winded (On actual cameras you have a better chance of detecting this).

If you want to try to get some non realistic results, then you need to probably add and weight paint a couple bones, maybe even 4.

Take both skeletons out into a DCC, merge the skeletons and the meshes with proper parenting.
Add your extra bones.
Study up on how to weight paint them.
And make a basic animation to export back into the engine.