Display date range filtered in Bex query

I am looking for a way to display the date range

TEXT_27.setText(DS_1.getFilterText(min"0CALMONTH"))+ " - "+DS_1.getFilterText(max"0CALMONTH"));

Of course there is no min or max available but that's the logic I am trying to reach.

I have checked different threads such as How to write script for DATE Range

But they are all based on displaying a date range based on dropdown lists or filters from within design studio.

However in this case, the 0CALMONTH is already filtered by a variable in bex so there is no selection from within the design studio application.

Any ideas on how to display the minimum month and the maximum?