How to add x minute(s) reminder to calendar on Android

Question

I am a new React Native developer and just started working with native modules so this is all new. I want to be able to set a reminder in x minutes prior to my calendar event on Android. i.e. reminder at start time or 5 minutes before. How do I do this?

The code:

    private void presentEventAddingActivity(ReadableMap config) {
        try {
            setPriorEventId(getCurrentActivity());

            final Intent calendarIntent = new Intent(Intent.ACTION_INSERT);
            calendarIntent
                    .setType("vnd.android.cursor.item/event")
                    .putExtra("title", config.getString("title"));

            if (config.hasKey("startDate")) {
                calendarIntent.putExtra("beginTime", getTimestamp(config.getString("startDate")));
            }

            if (config.hasKey("endDate")) {
                calendarIntent.putExtra("endTime", getTimestamp(config.getString("endDate")));
            }

            if (config.hasKey("alarm")) {
                calenderIntent.putExtra("hasAlarm", 1),
            }


            getReactApplicationContext().startActivityForResult(calendarIntent, ADD_EVENT_REQUEST_CODE, Bundle.EMPTY);
        } catch (Exception e) {
            rejectPromise(e);
        }
    }