I'm not a Google employee, but as far as I'm aware, there isn't one, and frankly, at this point I have to wonder if the lack of such a feature is a malicious way of preventing users from managing their storage utilization.

I've also had to resort to using rclone for this, which is absurd.

P.S. And don't forget: the data in the Trash folder counts against your quota. So if you use rclone to get folder sizes and start deleting things, you better be sure to empty the trash.

And that gets very difficult if the Trash has a lot of items in it, as the web interface will only delete a limited number of items from the Trash at a time.

As a result, you might also want to use rclone to delete permanently and bypass the Trash entirely.

Once again, while I tend to assume incompetence over malice for most things, in this case, you really gotta wonder...