AdminGetUser method does not return all fields in the list of UserAttrubutes

Hello I'm trying to get user information by userid but it does not return all list of UserAttributes

Trying to get using this method

 const user = await this.cognito
      .adminGetUser({
        ...this.defaultParams,
        Username: userId,
      })
      .promise();

Actual Response

{
  "Username": "XXXXXXXXXXXXXXXXXXXX",
  "UserAttributes": [
    { "Name": "sub", "Value": "Any" },
    { "Name": "email_verified", "Value": "true" },
    { "Name": "email", "Value": "abc@gmail.com" }
  ]
}

Expected Response

{
  "Username": "XXXXXXXXXXXXXXXXXXXX",
  "UserAttributes": [
    { "Name": "sub", "Value": "Any" },
    { "Name": "email_verified", "Value": "true" },
    { "Name": "email", "Value": "abc@gmail.com" },  
    { "Name": "name", "Value": "first name" } ,
    { "Name": "family_name", "Value": "last name" }
  ]
}

Could someone please let me know why AdminGetUser does not return name and family_name in the list of UserAttributes?