The assistant
spots the plural.
Built into the codebook assistant.
screenshot — to add
Codebook-assistant chat: user says "I want the outcomes each study measured." Assistant names the field outcomes (plural), sets it as a list-extraction, and writes the prompt to insist on completeness — every outcome, one per entry.
Describe what you want to extract. The assistant notices when the answer is plural and writes the field as a list — with the right default, the right plural name, and the "extract them all" instruction already in place.
Try it datamint.ing/assistant→
@karlrohe