With Qvera you can write functions and scripts that take advantage of Java and Javascript. That being said you can take advantage of Java class in order to get properties of a file.
Here is how I would find the document owner:
// First get the path to your file
var path = java.nio.file.Paths.get("C:\\Users\\Michael\\Desktop\\fhir_starter_example.docx");
// Now get a view of the attribute
var ownerAttributeView = java.nio.file.Files.getFileAttributeView(path, java.nio.file.attribute.FileOwnerAttributeView);
// Set the owner
var owner = ownerAttributeView.getOwner();
// Debug out the name of the owner
qie.debug('Owner: ' + owner.getName());