A CatalogItem variable for a custom UI component field. Custom variables embed a UI Macro, Service Portal Widget, Macroponent, or Virtual Agent Topic Block directly into a catalog form — replacing the standard input control with a fully custom rendering.
A CatalogItem variable for a custom UI component field with a displayed label. Like CustomVariable, it embeds a UI Macro, Service Portal Widget, Macroponent, or Virtual Agent Topic Block into a catalog form — but it also renders the question text as a visible label above the custom component.