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
let config = null;
    try {
      const properties = this._catDict.get("OCProperties");
      if (!properties) {
        return shadow(this, "optionalContentConfig", null);
      }
      const defaultConfig = properties.get("D");
      if (!defaultConfig) {
        return shadow(this, "optionalContentConfig", null);
      }
      const groupsData = properties.get("OCGs");
      if (!Array.isArray(groupsData)) {
        return shadow(this, "optionalContentConfig", null);
      }