class_docstr: a subcommand for jupytext-config
code: def __init__(self, name, help):
      self.name = name
      self.help = help
  
imports: import sys
  from argparse import ArgumentParser
  from pathlib import Path
  import jupyter_core.paths
  from .labconfig import LabConfig
label_desc: Use image node_id 1 to create a new SubCommand object  with example: obj = SubCommand(name, help)