Parse webpage using HtmlAgilityPack and Json

I'm attempting to extract the script tag from Hotpads' HTML, but I'm not sure how to turn it into a JSON object. I loaded an example link using HTMLAgilityPack, and it breaks where it searches for the tag. I'm going to deserialize it after.

main technique

   private static void ParseSite()
    {
        var url = "https://hotpads.com/308-s-9th-dr-ponte-vedra-beach-fl-32082-syw3eh/building";
        var web = new HtmlWeb();
        var doc = web.Load(url);

        var link = doc.DocumentNode.SelectSingleNode("//a[contains(.,'window.__PRELOADED_STATE__')]");

        if (link != null)
        {
            Console.WriteLine(link.InnerText);
        }
        Console.ReadLine();
    }

Code tag:

<script>
 window.__PRELOADED_STATE__ = {{SOME JSON HERE}}
<script>

Model:

public class Contact
{
    public string DATA_MODEL { get; set; }
    public string companyName { get; set; }
    public string contactName { get; set; }
    public string contactPhone { get; set; }
}