Best way to set "Content-Type" header in HttpWebRequest?

In my program I am generating a custom HttpWebRequest based off of the following JSON schema:

{
    "Endpoint": "String",
    "Method": "String",
    "Headers": [
       {
           "Name": "String",
           "Value": "String"
       }
    ]
}

And the code below loops through each Header and adds it to the HttpWebRequest

var request = (HttpWebRequest)WebRequest.Create(Endpoint);
foreach (var item in Headers)
{
    request.Headers.Add(item.Name, item.Value);
}

This works for most custom headers, but I came across the problem of setting the ContentType header. Since that specific header cannot be added in by the above method, I devised a way, using Reflection to set the request's ContentType property.

public static void SetHeaderValue(this HttpWebRequest request, string headerName, string headerValue)
{
    Type type = typeof(HttpWebRequest);
    PropertyInfo prop = type.GetProperty(headerName);
    if (prop != null)
    {
        prop.SetValue(request, headerValue);
    }
}

My question is this: Is using Reflection the best way to approach this, or even a safe way to approach solving this problem?