Apparently there is! And it even it on the fediverse: @Readlebee
This looks pretty like what I am looking for. Here's an update from the dev @Alamantus https://robbie.antenesse.net/2020/09/11/one-year-of-readlebee.html
Time to have a look at the code and maybe spin a local instance...
@bendineliot Just so you don't get your hopes up too much, I've got to let you know that #Readlebee is still pretty far from usable. I'm focusing on building the app first in my free time, and I'll be adding ActivityPub support after it's actually usable.
My goal is to make it very easy to spin up a local instance, but it's still got a long way to go before you actually can.
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