Unique Identifier Custom Form Field

[#1]

Ability to create a custom form field in a single line of text format where when a user is entering content into this field, WF can automatically identify upon saving if the value entered in that field is unique.

This would be helpful for scenarios where a team is working in a shared application external to WF and uses WF as a data-entry "source of truth." Since a team is using the shared external application, having a unique identifier type field provide an error/response if the item is not unique, this would ensure duplicate items aren't added into WF.