Add custom attributes to folder, currentFolder, or files in CKFinder

Question

We are developing a custom connector since we have to integrate CKEditor and CKFinder into our CMS (PeopleSoft). Since the CMS doesn't fully conform with normal file system regarding paths (i.e. /root/folder/file.fil), we would like to add a custom attribute to the folder object in the json response. For example, we would like to add the attribute contentid to each folders to identify each folder especially that it's possible to have the same folder/file name inside a folder. Then we would want to append that attribute when commands such as GetFolders and GetFiles so that we can use it for identifying the correct parent folder.