xml – How to generate a JSON with a property containing .(dot) in one of the property in Custom Policies?

I am trying to generate JSON in custom policies for request body of an API.
The required API request body is Required Request Body but while using the below code

<ClaimsTransformation Id="GenerateAMNotificationRequestBody" TransformationMethod="GenerateJson">
      <InputParameter Id="something:abc.0:user.property" DataType="string" Value="value" />

It generates the following JSON current JSON using above code

Is generating the JSON in above format possible ? Why ?

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