I finished Ahsoka. It’s a good story. Interestingly, I found that one need never have watched the Prequel films in order to understand what is going on, but it is extremely important to have watched The Clone Wars TV series (at least the last couple seasons) because the story refers to several key events that happened. The story also does not introduce characters that appeared in the show as though to an audience who hadn’t watched it (or had only watched the Prequels). It does give context and backstory, but only to preface Ahsoka’s feelings or actions at the time in the story.
I enjoyed it, and I’m glad I did because I was more than a bit disappointed by a few Star Wars stories I’d listened to recently. So I’m glad such disappointment isn’t a continuing trend.