IIRC, Vertica had/has a similar feature.

It's been around for quite while, but DB people hate to explain where they got an idea. For all I know Vertica got it from somewhere else; I think postgres got jsonb around the same time.

Now there’s a name I haven’t heard in 10 years. (I’m only tenuously connected to the kinds of teams that use/would have used that, so it doesn’t mean much.)