As expected, same problem as all the other UI toolkits. Tried several of their apps, was able to use none of them with a screen reader or other accessibility tools. It's nice if you draw the UI directly to the screen, but you skip a lot of steps that OS vendors took to make sure your app can be used by as many people as possible. So always keep that in mind if you're going to use any of these GUI toolkits for your own project!
Yea this is a big gap. It is planned but the task is huge. Once we have sufficient sponsorship or financial support in place you can be assured it will come.
[1]: https://github.com/AccessKit/accesskit I know I haven't yet done much with it this year. Hopefully I'll start doing substantial work on this again in the next few weeks. Threads like this one remind me that the world is waiting.