code: def test_json_ext_dtype_reading(self):
      # GH#40255
      data_json = """{
              "schema":{
                  "fields":[
                      {
                          "name":"a",
                          "type":"integer",
                          "extDtype":"Int64"
                      }
                  ],
              },
              "data":[
                  {
                      "a":2
                  },
                  {
                      "a":null
                  }
              ]
          }"""
      result = read_json(StringIO(data_json), orient="table")
      expected = DataFrame({"a": Series([2, NA], dtype="Int64")})
      tm.assert_frame_equal(result, expected)
  
imports: from collections import OrderedDict
  import datetime
  import decimal
  from io import StringIO
  import json
  import pytest
  from pandas import NA, DataFrame, Index, array, read_json
  import pandas._testing
  from pandas.core.arrays.integer import Int64Dtype
  from pandas.core.arrays.string_ import StringDtype
  from pandas.core.series import Series
  from pandas.tests.extension.date import DateArray, DateDtype
  from pandas.tests.extension.decimal.array import DecimalArray, DecimalDtype
  from pandas.io.json._table_schema import as_json_table_type, build_table_schema
label_desc: Use image node_id 11 for calling the TestTableOrient obj's underlying member method code with example usage: obj.test_json_ext_dtype_reading() without return types