how to deserialize the property which has xml value but rest are json values

I have an azure function and which receives the request as below . One of the property has xml value . But when I desearialize it to json ,i’m getting the error.

{
    "policyVersionedApiName": "petstoreoperationpolicyapi",
    "operationPolicies": [
        {
            "policyFormat": "rawxml",
            "operationId": "createUsersWithArrayInput",
             "policyValue": "<policies> <inbound> <base/> <ip-filter action="allow"> <address>10.100.7.1</address> </ip-filter> </inbound> </policies>",
        }
       
    ]
}