You can start by checking out this post: Count User interaction with Issue - #3 by zane.baranovska
This JavaScript in the example counts the users, but you need to change the JavaScript to show the last one.
Please, follow the documentation on JavaScript calculated custom fields, where to place them, and how to test them: JavaScript calculated custom fields .
Note that
- The settings and the JavaScript code should be placed in the eazyBI advanced settings; this section is available to Jira admins and eazyBI admins: Define calculated custom field in eazyBI advanced settings
- Test the JavaScrip part (code between
javascript_code = '''and''') on individual issues to see if the code requires some adjustments: Validate the Javascript code before using it in the custom field definition
Kindly,
Ilze support@eazyBI.com