project.json

"targets": {
  "openapi": {
    "executor": "nx:run-commands",
    "options": {
      "commands": [
        "npx ng-openapi-gen -c ng-openapi-gen.json",
        "yarn format"
      ],
      "cwd": "libs/myorg/shared/api",
      "parallel": false
    }
  },
}