Hi,
Apologies for the delay, I tried looking into this but as it stands it may be a feature request that I can pass up to Epic if the following information is irrelevant to your needs.
There’s some posts surrounding this topic where one user mentioned you could do something like map the fractures during an on break or on crumble event as they first spawn to track with each piece and then you could feed that data into the Niagara system.
Information regarding crumbling: https://forums.unrealengine.com/t/what-is-a-chaos-crumbling-event/2272545/2
It does look like there’s an item index for geometry collection events for example: https://forums.unrealengine.com/t/chaos-destruction-access-individual-fragments/240372/6
Grabbing these vectors, I think they can be used to set the particle position.
Regards