saltstack: archive.extracted template jinja
There is no much choices regarding your situation, I see two of them :


You ask your dev dpt to add your jinja templating to their builds (which may be hard or even impossible)
You can use salt module such as file.append or file.replace to add / replace your jinja code inside (this is not very clean that's the least we can say)


If you'd share an example that may help us to give some good advice