Request: Possible to store custom data inside calendar events?

[pasmai]

Is it possible to store custom data inside a calendar event?

  const onBeforeCreateEvent: ExternalEventTypes["beforeCreateEvent"] = (
    eventData
  ) => {
    const event = {
      calendarId: eventData.calendarId || "",
      id: String(Math.random()),
      title: eventData.title,
      isAllday: eventData.isAllday,
      start: eventData.start,
      end: eventData.end,
      category: eventData.isAllday ? "allday" : "time",
      dueDateClass: "",
      location: eventData.location,
      state: eventData.state,
      isPrivate: eventData.isPrivate,
      raw: "only thing that gets stored",
      extraField1: "more data here",
      extraField2: "even more!",
    };

    getCalInstance().createEvents([event]);
  };
  
    const onClickEvent: ExternalEventTypes["clickEvent"] = (res) => {
    console.log("Event Info : ", res.event);
  };


<Calendar 
        onClickEvent={onClickEvent}
        onBeforeCreateEvent={onBeforeCreateEvent}
/>

Expected Behavior

I would expect to be able to add custom fields to my calendar event object and also have them be stored.
I know that there is a raw field, but apart from that, any other data I set on the event does not seem to be saved.