code: def sample_viewer_config():
      return {
          "@jupyterlab/docmanager-extension:plugin": {
              "defaultViewers": {
                  "markdown": "Jupytext Notebook",
                  "myst": "Jupytext Notebook",
                  "r-markdown": "Jupytext Notebook",
                  "quarto": "Jupytext Notebook",
                  "julia": "Jupytext Notebook",
                  "python": "Jupytext Notebook",
                  "r": "Jupytext Notebook",
              }
          }
      }
  
file_path: jupytext/tests/unit/test_labconfig.py
imports: import json
  import pytest
  from jupytext_config.labconfig import LabConfig
label_desc: Use image node_id 1 for calling a global function with example usage: sample_viewer_config() and returns: dict