JFrog CLI search with json filespec ignoring the include?

Question

I'm using the below json filespec for a search query with Jfrog CLI but it's ignoring the "include" part of the spec. There's no documentation on using include within a filespec, just straight AQL examples.

{
    "files": [{
        "aql": {
            "items.find":{
                "$and" : [
                    {"created" : {"$before" : "1y"}},
                    {"repo" : {"$match":"docker-local"}},
                    {"stat.downloads":{"$eq":null}},
                    {"name" : { "$nmatch" : "sha256*" }}
                ]
            }
        },
        "sortBy":["created"],
        "include":["path","name","created_by"]
    }]
}

I'm pretty sure it's ignoring anything not in the "aql" object. I added a bunch of random entries like "foo":"bar" under include and sortBy and no error was thrown, nor was it acknowledged in anyway. My question is, where does the include fit into the spec.json file?