docs: def read_egginfo_json(pkg_name, filename=DEFAULT_JSON, working_set=None):
      """
      Read json from egginfo of a package identified by `pkg_name` that's
      already installed within the current Python environment.
      """
  
      working_set = working_set or default_working_set
      dist = find_pkg_dist(pkg_name, working_set=working_set)
      return read_dist_egginfo_json(dist, filename)