Is your feature request related to a problem? Please describe.

Please add an API to the 2 new LiquidGlass components which allows for creation of Unions (in swift this is glassEffectUnion(id,namespace).
Unfortunately, it seems to be not possible to create a union from multiple buttons with the current components. While a similar appearance seems to be possible with merging buttons into a background component animation behaviour is still very different. Hence, would be great if such an option could be provided. Thanks for consideration!

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