Sorry for the late reply, and thanks for posting that it works without issues.
In general any standard third-party shaders are expected to work if you don't need special Spine Slot blend modes (such as Additive Slot blend mode) or special colorization features such as the tint black feature. Unless the shader supports PMA blending, you just need to make sure that you export your atlas texture as straight alpha, and to disable Advanced - PMA Vertex Colors at your SkeletonRenderer (SkeletonAnimation) Inspector.
