Yes, but similar to Python on Postgresql, it comes with a bunch of security warnings attached.

I should have clarified in my original post but I'm envisioning more of: database server has a parser that understands python/javascript/c#/etc but projects a subset of library functions to avoid security dangers.

Essentially, expose the same functionality stored procedures already have but in a more accessible syntax.

What vendors mostly seem to have opted for is embedding the full language parsers directly into the database servers, which yields a lot of power and a lot of risk.