How to split USDZ file by animation?

Hello ! The only way that I can use multiple animation is to have multiple USDZ with single animation according to WWDC example

https://developer.apple.com/videos/play/wwdc2021/10074/

todo so, I should have file with single animation
but many sources like Sketchfab.. etc it has single GLTF , USDZ file with multiple animations,

I have blender but it's too difficult to export each animation to each modeling file.

can anyone let me know how to split file by animation?