How can we send notification to the HR on completion of a "Checklist"

Summary:

We have a requirement to send notification to the HR or Payroll on the completion of a 'Checklist', not specific task(s).

We have alert composer wherein we can create custom alerts but which criteria/event can be used in the checklist in order to how to trigger such notification for the stakeholders.

Please assist with the possible solution/workaround.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

23D

Code Snippet (add any code snippets that support your topic, if applicable):