File attributes in ajax request

[antos2]

Is any way how to send with file to backend a meta information about uploaded file?
A need in backend information about file last modification, which is in variable "file", I must add line into method uploadFile:

request_data.filelastlodified = file.lastModified;

into your source code. Exist any proper way how to do it without modification of source?
Thank you for the advice