How to get the field values before updation and after updation of a record in zoho crm using custom functions

Hi, I have a problem in task.

I want to send mail to owner if record is changed.

And I want to get previous values of fields as well as updated values. So that we can tell the owner about field previous and new data with field name.

I want to do this through workflows and custom functions.

Is it possible?

Kindly help...

Moderation Update(24th May 2024):

The enhancement to access the previous values is now available for early access. Know more about the same in the announcement below.

https://help.zoho.com/portal/en/community/topic/a-couple-of-minor-yet-powerful-enhancements-to-workflows-early-access

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