How to change size of bones while animating a SkinnedMesh rig?

I’m looking for a way to resize the bones of a rig in an animation. So in an animation a part of the rig might change size (get smaller or bigger) depending on what I want.
In blender I can directly change the size of bones to enlarge the rig I’m currently using. It looks like this:

No pose

Pose with some bone resized

However I can’t really find a way to do this in Studio. I can move and rotate the bones, but haven’t been able to resize them (in animation).

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