How can I assign a Smart Checklist template to existing Stories in Jira?

[Tyler Watts]

How can I bulk edit stories to apply a checklist t...

I have searched the Community and read the instructions including link above but I cannot determine how to assign an existing Smart Checklist template in bulk to existing Stories. The Workflow automation works great for new issues, but I have many existing which need the checklist.

Can someone explain how to do this please? The following answers did not explain how to set and run the trigger manually or in a schedule. Is there an actual guide?

Solved: Run Jira Automation Manually for existing Jiras

Thank you in advance