Why my response contains extra fields, Is this okay

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My actual response from apis is


{
  "restrictions":  
    "apple",
    "banana",
    "orange"
  ]
}

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{
  "$type": "System.String[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
  "$values": ["apple","banana","orange"]
}

This is response

The REST endpoint may return an object like in this case, instead of rows and columns. It looks like it is an array of strings.

You can use the String System Types > Deserialize, Deserialize Array or Deserialize Typed Array (depending on the situation) to return it as rows/columns instead.

https://help.nintex.com/en-US/k2cloud/userguide/current/Content/SBrokers/SB-Serialization.htm

It is also possible to chain the Service method in a single SmartObject method.

I tried it’s not working

"/TestStringArray": {
"get": {
"summary": "Get String Restrictions Array",
"description": "Returns the restrictions array made of strings.",
"operationId": "getTestStringArray",
"responses": {
"200": {
"description": "A string array response",
"schema": {
"$ref": "#/definitions/TestStringArrayResponse"
}
},
"default": {
"description": "Unexpected error",
"schema": {
"type": "object",
"properties": {
"message": {
"type": "string"
}
}
}
}
}
}
}
},

"TestStringArrayResponse": {
"type": "object",
"properties": {
"restrictions": {
"type": "array",
"items": {
"type": "string",
"example": "apple"
}
}
}