nrwl--nx/packages/nx/docs/run-script-examples.md

project.json:

"targets": {
    "build": {
        "executor": "nx:run-script",
        "options": {
            "script": "build-my-project"
        }
    }
}

nx run frontend:build

The build target is going to run npm run build-my-project (or yarn build-my-project) in the packages/frontend directory.

Caching Artifacts

By default, Nx is going to cache dist/packages/frontend, packages/frontend/dist, packages/frontend/build, packages/frontend/public. If your npm script writes files to other places, you can override the list of cached outputs as follows:

"targets": {
    "build": {
        "executor": "nx:run-script",
        "outputs": ["{projectRoot}/dist", "{projectRoot}/docs"],
        "options": {
            "script": "build-my-project"
        }
    }
}