Checklist Formatter not showing in Agent Workspace


Details

The 'Checklist' is not showing on Agent Workspace view is because the 'checklist' is a UI-Macro and Agent Workspace does not support macros.
That is expected given the fact that Agent Workspace runs mostly on ReactJS, and Jelly is not supported there (macros are Jelly based scripts).
Hence any formatters having Jelly-based code will not be shown on Agent Workspace view.

Additional Information

More information on supported field types in Agent Workspace at

https://docs.servicenow.com/csh?topicname=agent-workspace-supported-field-types.html&version=latest