Provide Json format download string.
Example:

{
  "files": [
    {
      "pattern": "RepoName/path/to/*.txt",
      "target": "target/local/path/"
    },
    {
      "aql": {
        "items.find": {
          "repo": "RepoName",
          "$or": [
            {
              "$and": [
                {
                  "path": {
                    "$match": "*"
                  },
                  "name": {
                    "$match": "*.txt"
                  }
                }
              ]
            }
          ]
        }
      },
      "target": "target/local/path/"
    }
  ]
}