{
    "property_1": "value_1",
    "property_2": "value_2",
    "property_3": {
      "_some_property_1": 1,
      "_some_property_2": "some_value_2",
      "some_property_3": "some_value_3",
      "some_property_4": "some_value_4"
    },
    "property_4": "value_4",
    "property_5": "value_5",
    "iproperty_6": "Nvalue_6",
    "property_7": "value_7",
    "property_8": "value_8",
    "property_9": "value_9"
  }

this is one of the field of my document I want to extract some fields from property_3 using MongoDb Aggregation Pipeline .I have stored the whole json in string format. I want to perform it in pipeline itself.

I tried doing using 2 stages converting the field to JObject but failed