is it possible to do server-side sort by non-item domain fields?

[ukostas]

I am trying to get top 10 most downloaded artifacts. I want to do all sorting part by server to reduce amount of data transferred to client.
My first guess is following spec file (top 10 most downloaded):

{
  "files": [
    {
      "aql": {
        "items.find": {
          "repo": "repo-name"
        }
      },
      "sortBy": "stat.downloads",
      "sortOrder": "desc",
      "limit": 10
    }
  ]
}

which does not work - got 10 files not sorted by "stat.downloaded". After reading limitations of sort in AQL I got a feeling that this is not possible - stat field is not a domain field of item hence sort won't work on server side.

My question is: is it possible to to do such server-side sorting - via API / CLI / Spec file ?

Thanks!