Spine-Unity运行时中包含的着色器目前不能直接提供这样的效果。
The shaders included in the Spine-Unity runtime currently provide no such effect straight out of the box unfortunately.

但是，您可以在Spine骨架对象上使用其他Unity着色器，因此可以随意使用Unity Asset存储中的其他资源，并通过GameObject的“Material” - “Shader”属性分配不同的着色器。
You can however use other Unity shaders on Spine skeleton objects, so feel free to use other assets from the Unity Asset Store and assign a different shader via the Material - Shader property of the GameObject.