How Do I Embed an external font to PDF from html conversion

public MemoryStream GeneratePdfAspose(string html)
{
    var outputStream = new MemoryStream();
    var htmlLoadOptions = new HtmlLoadOptions();
    htmlLoadOptions.PageInfo.Margin.Bottom = 30;
    htmlLoadOptions.PageInfo.Margin.Top = 30;
    htmlLoadOptions.PageInfo.Margin.Left = 5;
    htmlLoadOptions.PageInfo.Margin.Right = 5;            

    using (var inputStream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(html)))
    {
        using (var pdfDocument = new Document(inputStream, htmlLoadOptions))
        {
            pdfDocument.Save(outputStream);
        }
    }

    return outputStream;
}

I am using the above code snippets to convert html to pdf. How am I going to include an external Unicode font to be embedded inside. some chinese characters are not rendered properly and appeared as square boxes.

@scinix

If specified font is installed in the system you do not need to set it in code while converting HTML to PDF. However, if you are facing any issues, please share your sample HTML in .zip format with us so that we can test the scenario in our environment and address it accordingly.