WCF: System.ServiceModel.Configuration nuget package is missing in .NET CORE 3.1

Question

I am trying to get the endpointURL. To get those endpointURL, I have to use system.servicemodel.configuration nuget package. However, in .net CORE I am not able to find those package. I am getting error in the below code

    public static string GetEndPointUrl(string contractName)
    {
        var address = string.Empty;

        var serviceModel = (ClientSection)ConfigurationManager.GetSection("system.serviceModel/client");
        var endPoint = serviceModel.Endpoints.Cast<ChannelEndpointElement>().SingleOrDefault(x => x.Contract == contractName);
        if (endPoint != null)
            address = endPoint.Address.AbsoluteUri.ToString();
        return address;
       
    }

I am getting error in clientSection and ChannelEndpointElement which is the part of system.servicemodel. I dont know what is the alternative of this.