Fn.calendar is not exposed for its use in Automation chain/scripts

• Create an automation chain that use Fn.calendar, e.g.

  - Context.FetchDocument
  - Document.AddPermission:
      permission: Read
      acl: local
      begin: "@{Fn.calendar(WorkflowVariables[\"startDate\"])}"
      blockInheritance: "false"
      comment: share me
      email: "moniquesdemo@gmail.com"
      end: "@{Fn.calendar(WorkflowVariables[\"endDate\"])}"
      notify: "false"
      username: John
  

• Execute the automation chain, e.g. from a workflow or an action button. You get this message:

  Caused by: [Error: unable to resolve method: org.nuxeo.ecm.automation.features.PlatformFunctions.calendar(java.util.Date) [arglength=1]]
  [Near :

  Unknown macro: {...Fn.calendar(WorkflowVariables[ ....}

  ]

According to the Nuxeo Documentation Fn.calendar it's a valid expression to be used in automation scripts/chains:

Note: Fn.calendar it's not exposed for its use in automation scripts: