Not as a global rating.
But you could have a datasheet, for lack of a better word. You would collect all the information about the usual topics that are relevant for making something considered a higher age rating than 0.
The ratings criteria for specific countries are known, so from that datasheet a rating can be guessed. There will be some uncertainity and inaccuracy and even some dishonesty, but that is an issue for all ratings and reviews and the like.
But you would not collect that information actively. You would collect it by volunteers that just give an extensive rating after having played a game. There are people that like to do such things. Giving reviews. Combine the review with a questionaire for sensitive topics and you get a collection for that datasheet to calculate region specific rating estimates. You can even weight that rating's accuracy by previous honesty and accuracy of the reviewers.