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No, but lemmy has added support to do that natively! The PR was merged yesterday and should land in version 0.19. Eternity would need to implement the front-end for that though. Until then you can simply block instances through the web-ui and use eternity after that. Posts, comments etc. from the blocked instance won’t be shown in eternity.
Idk. But I just subscribed to a whole lot of communities and now don’t see anything else