We definitely need to make this more obvious, but you can import an OPML. I usually just drag it from my downloads folder into the app, but it also works if you use the 'upload file' command.

The language is a little different than folders/tags (and believe me, I stan folders the one and only time I ever hit the front page of HN it was for an article written in defense of using folders for notetaking) but you can get basically the same effect with filtered views. Here's a deep dive our community manager Erin made if you're interested: readwise.io/reader202

I hope that helps!

PS: Dan said more export features are coming.