No, I haven't seen that before.
Actually, the best supplement to Rocket that I've found by a long long way is italki. I started with a tutor 8 weeks ago to actually talk live with a tutor and I can't tell you how much it's helped me. In fact, I'd recommend my teacher directly, she is just fantastic. https://www.italki.com/teacher/2498052
I've always said that I can read and write reasonably well but my listening and speaking is poor but that follow everyone's pattern. It's SO much harder to speak. I've done 8 lessons with Pier Paola now and I have so far to go but I've learned so much in that short space of time.
What level are you up to?