The spec for this action:
https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#G11.2111850
An example of a form using this action:
https://www2.illinois.gov/rev/forms/reg/Documents/reg-1-mr.pdf
const nestedName = xref.fetchIfRef(value[0]);
      if (typeof nestedName !== "string") {
        return null;
      }
      const nestedOrder = parseOrder(value.slice(1), nestedLevels);
      if (!nestedOrder || !nestedOrder.length) {
        return null;
      }
      return { name: stringToPDFString(nestedName), order: nestedOrder };
    }
    const xref = this.xref,
      parsedOrderRefs = new RefSet(),
      MAX_NESTED_LEVELS = 10;
    return {
      name: isString(config.get("Name"))
        ? stringToPDFString(config.get("Name"))
        : null,
      creator: isString(config.get("Creator"))
        ? stringToPDFString(config.get("Creator"))
        : null,
      baseState: isName(config.get("BaseState"))
        ? config.get("BaseState").name
        : null,
      on: parseOnOff(config.get("ON")),
      off: parseOnOff(config.get("OFF")),
      order: parseOrder(config.get("Order")),
      groups: null,
    };
  }
  get numPages() {