Integration or Plugin for Bitbucket/Jira to Alert Users on PRs Impacting a Certain Subdirectory

I am seeking ideas or recommendations for a plugin or integration that can inform users when a pull request (PR) modifies files within a specified subdirectory or its subcomponents.

For instance, if a PR alters a file located at repo/main/ALERTME/…, I would like it to trigger an email notification or some type of alert to the user.

This functionality should also activate for multiple subdirectories within …/ALERTME/someOtherDirectory. I welcome any suggestions, including those that may require a purchase for Jira or Bitbucket.