shareit: XMl Response from WEB API solution

I have a Web API solution which is configured to respond results always in JSON format as below

config.Formatters.JsonFormatter.SerializerSettings.Formatting =
                Newtonsoft.Json.Formatting.Indented;

But now I have a requirement to respond only one of the API calls with XML Response . But if I add the XML formatter to the system

config.Formatters.XmlFormatter.UseXmlSerializer = true;

then all the API calls get affected.

I have a XML string hardcoded which I want to give as reponse .
How can I solve this problem ?

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