Issue Summary

At the moment, customers don't have the option to use Data classification (a feature of Atlassian Guard Premium) in the automation rules inside Jira to configure the data classification to be automatically updated according to content scanned.

This functionality is available only for Confluence at the moment:

It would be nice to have that option available for Jira and JSM as well, allowing customers to classify data inside Jira using their automation rules.

Workaround

Currently, there is no direct workaround for that. 

The customer can use this option to bulk update the security items of several cards at once if needed: 
Update Issue Security levels on existing work items in Jira Cloud