In the template language docs for Adobe Document Generation, mathematical expressions can be done using tags like below...
{{expr(revenue - expenditure)}}
This works and outputs a number, but is there any way to apply formatting to the number, for example, $50,000.00 where the calculated value is just 50000?
Remember that doc gen uses JSONata (https://docs.jsonata.org/overview.html) for it's template parsing. As I've learned and played with docgen, the JSONata docs have been really helpful. For this particular example, there's a function built in documented under Numeric functions - $formatNumber. At minimum it takes a number input and a mask. So to format it as you would want, use:
{{$formatNumber(revenue-expenditure, '#,###.00')}}
Notice that you don't use expr above, just the function.