Smart Labels are labels that can be added to Issue List to highlight Jira issues that need attention. Users can add pre-existing Jira filters as labels, or, make custom labels using JQL.

See it in action below!

With Issue List in Edit mode, navigate to the Columns tab on the right side and click + Add a Smart Label
In the dropdown, select a Smart Label option:
1. Add saved Filter Smart Label: Click this option to add an existing Jira filter as a Smart Label
2. Add custom JQL Smart Label: Click this option to use custom JQL to build a Smart Label directly in Issue List
Click Save or Insert

Click the pencil icon to the right of the selected filter, or, click into the text box that says Label
Type your desired label name in the text box