class_docstr: A wrapper for schema for a service.
class_docstr_tok: ["A","wrapper","for","schema","for","a","service","."]
docstr: Returns schema json dictionary
docstr_tok: ["Returns","schema","json","dictionary"]
code: def schema_json(self) -> dict:
      """Returns schema json dictionary"""
      return self._schema_json
  
imports: import json
  from typing import List, Optional, Union
  from nemo.utils import logging
label_desc: Use image node_id 2 for calling the ServiceSchema obj's underlying member method code with example usage: obj.schema_json() and returns: self