Add contentRating property to Meta Object

[kekazoh]

One of the things I miss in Stremio is having the content rating (or maturity rating) for each of the movies / shows. I was thinking of making an addon for that, but there's no property assigned to that purpose on the Meta Object.
Meaning that I'd need to use the year or rating property to show that value, and that solution seems a bit "patchy".
I'm sure the current catalogs already give this information, but if not, would it be possible to include it at least in the Meta object to give the addons a standardized way to show it?

Thank you!