In the manifest.json of your mod. Instead of or in addition to carpenter, you would use blacksmith or cook.
"mixintos": {
"stonehearth/jobs/carpenter/recipes/recipes.json" : "file(jobs/carpenter/recipes/recipes.json)"
}
You can find some more details and instructions from the startermod_basic and startermod_items located here https://github.com/stonehearth