Instance count for same AUv3 component in app

Curious if there is a sound way for an AUv3 component to identify how many other instances of it that are running on a device. For instance, if GarageBand has 4 tracks and all of the tracks use the same AUv3 component, is there a sound way for each one to obtain a unique index value?

Thanks!

You could use group defaults?

Instance count for same AUv3 component in app
 
 
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