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
get value() {
    return this._value;
  }
  set value(value) {
    if (!value || value === "Off") {
      this._value = "Off";
    } else {
      super.value = value;
    }
  }
  _getExportValue(state) {