Web Confidential for macOS has this feature, which the author characterises as “an intuitive, easy-to-use cardfile metaphor”. I used Web Confidential, before switching to KeePassX which offers only title, username, password, URL and description, and it’s one of the features I miss. Web Confidential offers a fixed set of card types, which was a limitation when dealing with data which has high variability, but even a fixed set of card types is better than one type of card. Based on experience with Web Confidential, I know this feature is useful.
Related to: As an administrator I can create new secret types and define their associated input fields.