Get heart rate variability from polar H10 (bluetooth low energy windows 10)

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C#

Bluetooth

UWP

I am working with Polar H10 to get the Heart Rate Variability from it.

I am running Bluetooth Low Energy Sample from Microsoft.

I have used this sample to get the heart rates from another polar device (Polar OH1) and it worked fine.

But now I want to get the HRV from Polar H10. But BLE sample code is not really showing me the HRV Characteristic which it should just like heart rate.

What adjustments should I make to the sample code?

These are the only characteristics I am seeing:

What I have tried:

// first layer keys are serviceUuid's
// second layer keys are characteristicUuid's
// with their respective name/description as values
{
    "1800"    /* Generic Access */                      : {
    "2a00": "Device Name",
    "2a01": "Appearance",
    "2a02": "Peripheral Privacy Flag",
    "2a03": "Reconnection Address",
    "2a04": "Peripheral Preferred Connection Parameters"
},
"1801"    /* Generic Attribute */                   : {
    "2a05": "Service Changed"
},
"180d"    /* Heart Rate */                          : {
    "2a37": "Heart Rate Measurement",
    "2a38": "Body Sensor Location"
   // This is where it should show Heart Rate Variability //
},
"180a"    /* Device Information */                  : {
    "2a23": "System ID",
    "2a24": "Model Number String",
    "2a25": "Serial Number String",
    "2a26": "Firmware Revision String",
    "2a27": "Hardware Revision String",
    "2a28": "Software Revision String",
    "2a29": "Manufacturer Name String"
},
"180f"    /* Battery Service */                     : {
    "2a19": "Battery Level"
},
"6217ff4b-fb31-1140-ad5a-a45545d7ecf3" /* unknown */: {
    "6217ff4c-c8ec-b1fb-1380-3ad986708e2d": "unknown", /* read:true */ // value = 
     uInt16Array [3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
    "6217ff4d-91bb-91d0-7e2a-7cd3bda8a1f3": "unknown" /* write:true, 
     indicate:true, descriptors:{ descriptorUuid: "2902" }*/
 {
     /* 6172 */
     this service has all the numbers which I have no idea about. 
     Example: 10905, 10906, and etc.  
  }
}