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 indices = new Set(event.detail.indices);
            const options = event.target.options;
            Array.prototype.forEach.call(options, (option, i) => {
              option.selected = indices.has(i);
            });
            storage.setValue(id, {
              value: getValue(event,  true),
            });
          },
          editable(event) {
            event.target.disabled = !event.detail.editable;
          },
        };
        this._dispatchEventFromSandbox(actions, jsEvent);
      });
      selectElement.addEventListener("input", event => {
        const exportValue = getValue(event,  true);
        const value = getValue(event,  false);
        storage.setValue(id, { value: exportValue });
        this.linkService.eventBus?.dispatch("dispatcheventinsandbox", {
          source: this,
          detail: {
            id,
            name: "Keystroke",
            value,
            changeEx: exportValue,