Hi Rishabh, you might be interested in checking out this Idea - feel free to add your votes & comments!
https://community.tableau.com/ideas/8008 Data Alerts to send to Slack
[Program Manager - Tableau Community Forums]
There is a plugin (app) for slack to generate an email address for a channel. Then you can run extracts as a user and put in that slack generated email address as that user's email address. You will get the failure notification emails to appear in the channel. The problem is that it is not very readable in slack, but still possible.
Thanks for this, Iwona!