how to get github discussions categoryId

gh api graphql -f query='
{
  # https://github.com/github/docs

  repository(owner: "github", name: "docs") {
    id # RepositoryID
    name
    discussionCategories(first: 10) {
      nodes {
        id # CategoryID
        name
      }
    }
  }
}'

Result:

{
  "data": {
    "repository": {
      "id": "MDEwOlJlcG9zaXRvcnkxODk2MjE2MDc=",
      "name": "docs",
      "discussionCategories": {
        "nodes": [{
            "id": "MDE4OkRpc2N1c3Npb25DYXRlZ29yeTI1MDUzMjQ3",
            "name": "General"
          },
          {
            "id": "MDE4OkRpc2N1c3Npb25DYXRlZ29yeTI1MDUzMjUw",
            "name": "Ideas"
          },
          {
            "id": "MDE4OkRpc2N1c3Npb25DYXRlZ29yeTI1MDUzMjQ5",
            "name": "Q&A"
          },
          {
            "id": "MDE4OkRpc2N1c3Npb25DYXRlZ29yeTI1MDUzMjUx",
            "name": "Show and tell"
          }
        ]
      }
    }
  }
}

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Ref: