This template displays the name of the last user who changed the Assignee field if it was ever changed.
If there is nothing to display, the result will be “None”.
Configuration
To use the Last assignee change author template, simply select it from the template grid. Filter by Assignee to find it faster.
Parameters
This template does not require any additional parameter configuration.
Expert mode
If you switch to Expert mode you can see the Smart field in the Expression Parser. You can now tweak the expression to create a custom smart field based on this template.
Expression
Jira expression:
issue.changelogs.filter(changelog => changelog.items.some(item => item.fieldId == 'assignee')).map(changelog => changelog.author.displayName)[0] || ""