can't emit raw string into request?

This is probably a strange request for a strange API that takes nonstandard JSON that had to be specially formatted.

Following this stackoverflow question: http://stackoverflow.com/questions/30515068/send-json-raw-object-retrofit

public class TypedJsonString extends TypedString {
    public TypedJsonString(String body) {
        super(body);
    }

    @Override public String mimeType() {
        return "application/json";
    }
}

The API looks like this:

    @POST("/fetch")
    public abstract AvailableCampaigns sendDataAndFetchCampaigns(
            @Retrofit.Header("User-Agent")
            String userAgent,
            @Retrofit.Query("Site_ID")
            String siteID,
            @Retrofit.Body
            TypedJsonString data);

I tried to use a TypedJsonString as well as a plain String but the LoganSquareConverter doesn't know how to handle either one. I just want a string passthru into the body. Any suggestions on how to do this?

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