Yes. There are MLE translation charts for AAA to MLB performance. The general drop in performance is 100-200 points compared to what the player is doing in AAA. The players you have noted were quite young in AAA and still improving which is why their numbers in MLB are comparable or better to what they did in AAA. However, if you only look at what they did at AAA in the same season as when they were promoted to MLB you will see, on average, a dropoff of 150 points of OPS depending on league and ballpark context.
League Equivalencies | Sabermetrics Library
Michael Helman is 28 years old, the age when baseball players are at their peak performance at the plate. His actual AAA performance minus 150 points should be a good estimate for his MLB performance. If his performance is better, then he got better. He's equally likely to get better as Amed Rosario.
Helman is relevant because the current projection has him getting 300+ PAs on the 26-man roster. That's who they would be replacing by signing a veteran like Rosario. I think both options are a bad bet for a team with playoff aspirations.