The dump needs to contain the data that is associated with your user and unless they store "user has rated Minions (2015) with 5" they don't need to tell you that. (Quite the opposite - it would be illegal for them to do so unless they also tell you what they'Ve stored exactly the way they've stored it)

Do note that nobody actually knows* if what I'm saying is true, but that's just another problem of GDPR