Inside a tag helper parse a tag helper from a string .NET CORE 2.0

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C#

.NET-Core

I am using a tag helper to pull in content on my page from my DB so for example for my navigation tag helper is

[HtmlTargetElement("navigationmenu", TagStructure = TagStructure.WithoutEndTag)]
    public class NavigationMenuTagHelper : TagHelper
    {
        private readonly IConfiguration _configuration;
        public NavigationMenuTagHelper(IConfiguration configuration)
        {
            _configuration = configuration;
        }
        
        public string MenuName { get; set; }
        
        public override void Process(TagHelperContext context, TagHelperOutput output)
        {
            /* Suppress the tag then select navigation menu from db */
            output.SuppressOutput();
            
            /* Connect to layout DB */
            SqliteConnection layconn = new SqliteConnection(_configuration.GetConnectionString("LayConn"));
            layconn.Open();
            SqliteDataReader r = layconn.RunReader("SELECT HTML FROM MenuHTMLView WHERE MenuName = @x0", MenuName);
            while (r.Read()) output.PostElement.AppendHtml(r.GetString(0));
            r.Close();
            layconn.Close();
        }
    }

Output

<div class="collapse navbar-collapse" id="navbarCollapse">
          <ul class="navbar-nav mr-auto">
            <li class="nav-item"><a class="nav-link" asp-page="/Index">Home</a></li>
           </ul>
        </div>

Expected output

<div class="collapse navbar-collapse" id="navbarCollapse">
          <ul class="navbar-nav mr-auto">
            <li class="nav-item"><a class="nav-link" href="/Index">Home</a></li>
           </ul>
        </div>

The problem is that things like asp-page are spat out on the page instead of being processed into hyperlinks. I need my tag helper to be able to parse the tag helpers pulled from my db properly as I intend to pull other tag helpers out of the DB for content sections too.

Thanks, Ashley

What I have tried:

output.PostElement.AppendHtml(r.GetString(0));
output.PostElement.Append(r.GetString(0));