Add "Trailing Twelve Months (TTM)" option to Calendar-Based Column Options

As a TBMA, I would like the option to quickly declare a metric's column should show its value as a sum of the current month + the past 11 months.

Today, I can select from options highlighted in the Help documentation here:
https://help.apptio.com/en-us/studio/reports/tables/add-calendar-based-column.htm

The closest option to my desired use case is "Last 12 Months (LTM)", but it sums the prior month + 11 months before it. It doesn't include the current month.

With the proposed new "Trailing Twelve Months (TTM)" option, the metric's value would reflect the current month + 11 months before it and the metric's column header would show a "TTM" prefix (similar to how the header shows "LTM" when the "Last 12 Months" option is selected).

The only way to achieve this without the proposed TTM option is to use a series of TimePeriod function calls like the following:

=TimePeriod(Cost,0)+TimePeriod(Cost,-1)+TimePeriod(Cost,-2)+TimePeriod(Cost,-3)+TimePeriod(Cost,-4)+TimePeriod(Cost,-5)+TimePeriod(Cost,-6)+TimePeriod(Cost,-7)+TimePeriod(Cost,-8)+TimePeriod(Cost,-9)+TimePeriod(Cost,-10)+TimePeriod(Cost,-11)

The use of the TimePeriod function is this way is calculation intensive not easy to apply everywhere. The proposed "TTM" option makes it easier and quick to apply....in the same way the other Calendar-Based Columns options are.

We already have many instances using the TimePeriod option today, so please consider implementing soon so we can eliminate use of the TimePeriod in the way described above for the work-around.