Ah ok. I misunderstood. You can just mute that note and not see more boosts?

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Actually I’m not sure if that works. I know it mutes notifications but not feed šŸ™ƒ

More like aggregation of boosts, similar to what happens with likes and other reactions.

So basically, only show the note on the last boosted timestamp, and show all (at that moment known) boosts in the header:

Karnage and 4 others boosted.

This does make the timeline ordering unstable, so it's probably trickier than it looks.