The feedback summary says inking on pdf is on the list for October, and it is there in latest canary 79.0.292.0 version. However, it is still lacking some basic pdf functions like bookmarks, outline, highlight which were there in the classic edge. Read aloud also doesn't work in pdfs yet.
Please don't mark it addressed before you add these features too. On the other hand, since ebook support is also going away, can we expect a return of the standalone reader app?