Show info message about Affected Services field when adding it on the request form

Problem

On a ITSM project, it's possible to add the custom field Affected Services on the portal request form.

As stated on the documentation, the field is only visible for licensed users.

Suggestion

It would be great if, when adding the field to the form, a info or warning message to appear for the project administrator to know that only Jira users can view this field in the portal.