Using AutoPKG to add json file to firefox

Hello,
I'm looking into using Auto-pkg to automate my packaging process and I'm a little confused on the idea of recipes. I understand recipes allow you to modify how an application is packaged, but the extent of my control isn't clear to me. Specifically, can I package a json file to deploy with an app like firefox? Normally I would just push this json file and firefox to a machine then package them together with composer. Thanks