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
constructor(otherButtons, data) {
    super(data);
    this.exportValues = [this.exportValues];
    this._radioIds = [this._id];
    this._radioActions = [this._actions];
    for (const radioData of otherButtons) {
      this.exportValues.push(radioData.exportValues);
      this._radioIds.push(radioData.id);
      this._radioActions.push(createActionsMap(radioData.actions));
      if (this._value === radioData.exportValues) {
        this._id = radioData.id;
      }
    }
  }
  get value() {