Monetary or Numerical fields in Omnifocus

Whether its tracking recurring invoices, or entering travelling mileage, I find myself in need of entering and cumulating numerical values across multiple tasks. Would there be a way to capture such a value from a tag encoded in the task name for exemple:

Mobile phone bill - Jan 2017 - /250$
Mobile phone bill - Feb 2017 - /250$

And creating a 'sum across all tasks in list for any number in between an / and a $…

Or for mileage

Travel from A to B on date 1/1/2017 - /200km
Travel from C to D on date 2/1/2017 - /210km

And creating a 'sum across all tasks in list for any number in between an ‘/’ and ‘km’…

Any way to enable this via some kind of API or task name parsing macro ?

F.