File Templating modules

We recently added jinja2 templating support to ncf (with a Rudder agent) using:

• A "dumpdatastate()" function that outputs the datastate in json format into a file
• A python script that, using this datastate file and the template file, produces the output string that is then written into the destination using a files promise

A possible implementation of this as a standard templating method in CFEngine would be a special modules type (like for packages) passing the datastate() on standard input to a script that would output the expanded template, which would allow to support several templating languages, what do you think about it?