how to pass an extra identifier along with image while uploading

I would like to pass an object as an extra parameter while uploading the image. the problem here is, The value will get changed after the editor loads the config info (additionalRequestData).

If the value in the object gets changed, I want the editor to pick the new value instead of the value which we passed while initializing editor.

How can I do that, Pls help me
Thanks in advance.