Having this capability within a self-service action input form would allow large organizations with large amounts of data to pull in targeted, up-to-date information from elsewhere just-in-time within a self-service action. This type of data is usually not relevant enough to be contained within the software catalog, and is therefore not a good candidate for an entity selection dropdown. The type of data that might be helpful to fetch quickly within a self-service action input would be a filtered subset of a ServiceNow table, for example, that would be otherwise simply taking up space in the catalog (since it would not require additional properties or ownership information, and would be used only during the course of a self-service action run).