Ok, perhaps nothing for every-day-templating...
The first 10 square numbers:
$CMS_VALUE([1..10].map(x -> x*x))$
Even numbers between 1 and 100:
$CMS_VALUE([1..100].filter(x -> x.even))$
$CMS_VALUE([1..50].map(x -> x * 2))$
The count of numbers between 1 and 100:
$CMS_VALUE([1..100].fold(start:0, x -> start+1))$
The sum of numbers from1 and 100:
$CMS_VALUE([1..100].fold(y:0, x -> x+y))$==$CMS_VALUE((100 * 101) / 2)$
The product of numbers from 1 to 100 (factorial):
$CMS_VALUE([1..100].fold(y:1, x -> x*y))$
Try the last one in a calculator
Tested with FS4.2R2