Sure, I'm familiar with it. It's nothing compared to what Dhall can do.
... unless of course it's grown to a similar point. As of about a year ago, for some complex transformations I had to stitch together multiple invocations of jq using pipes, etc. etc. That may have been my inexperience with using it, though.
Regardless, the point about typing stands. Dhall uses structural typing/subtyping which turns out to be hugely useful for config transformation.
