I don’t believe there is any ereader that specifically supports bookshop.org, but bookshop does have some drm-free books that you should be able to download and put on any ereader.
Edit: you do have some ereaders that run android, so you might be able to put the bookshop app on there.
Oh I love the rest is history, they’re so good at keeping me interested in random history stories. Plus, in my country their ads don’t seem to work.