Looking for expression or component to display rule documentation on an interface

In Appian by default the rule description is displayed below the expression editor when you click within the brackets after rule name. Generally we rely on the same to understand the rule's functionality. So for your utility objects you can provide a detailed description and user's can get insights while using the rule.

So, alternate to help() function, simply clicking inside rule parentheses can give the description as well as intended parameter details. Generally all devs are familiar with this as well. Hope this helps.