In Aeon Timeline, the era is defined as the restart of the year count. Therefore, I hardly believe that such gaps fit into the concept of the program’s internal calendar calculation. Besides, such a change would only support a workaround on your part, so it wouldn’t solve your original problem, would it?
Perhaps a workaround can be found with the available resources that will allow your annual count to be displayed? We have previously seen examples here in the forum of how a granular definition of eras can be used to create rather unusual calendars. See the Zodiac calendar thread.
You could consider designing a similar solution. Programming skills are an advantage here.
How is your fictional calendar defined in terms of the exact counting of years and months? How long is the time span that needs to be taken into account?