On Export to excel /csv/json add disclaimer information

[kshipra]

I would like to add disclaimer information on files exported in different formats.
Is there a callback function that I can use to add information?

e.g.
# <Company> Confidential. Do not distribute.         
# Copyright (c) 2007 - 2017  All rights reserved.

I am using client side export.

[paramvir]

You can append additional rows to grid data in the beforeExport event and subsequently remove them when export is complete.

https://paramquery.com/pro/api#event-beforeExport