Yes you can find sources advocating for leading commas and it's commonly used. I have "Google BigQuery: The Definitive Guide" on my desktop, it was written by senior Google employees involved in the steering and use of the product inside, for what it's worth, and it advocates for leading comma and SHOUTING THE KEYWORDS.

I personally disobey both recommendations (I mean, the book is worth it for other reasons) but both those conventions are very commonly used.

I meant more the the "center" layout that the commenter above was describing, it'd seem quite laborious to maintain by hand in most environments, if not using a particular one that supports it out of the box.