As an adult with severe ADHD, I primarily listen to audiobooks. It helps me because I can listen to them when doing something else because its hard to just sit still and read a book for more than a few minutes.
My younger sister had ADHD and I inspired her to read first by reading TO HER, and reading books that I had found really interesting at her age, but refusing to finish the book (so she had to read it herself to find out what happened). I remember reading Trumpet of the Swan and The Westing Game.
I also introduced her to audio books and she often would listen to books over and over again (she was 8 or 9 before she would read on her own). For some some people physical books aren’t the thing, but I still consider audiobooks reading and there are both free apps online as well as public libraries with online catalogs of audiobooks you can check out.