If you need to specify that some type is a key of some object where value is of type string you may use such construct.

List.tsx

interface Props<T extends Record<K, string>, K extends keyof T> {
  data: T[];
  row: ComponentType<T>;
  primaryKey: K;
}

function List<T extends Record<K, string>, K extends keyof T>({
  data,
  row: Row,
  primaryKey
}: Props<T, K>) {
  return (
    <ul>
      {data.map((element) => (
        <Row key={element[primaryKey]} {...element} />
      ))}
    </ul>
  );
}