Parsing Macro's inside GridEditors

Rte.cshtml

@using Umbraco.Web.Templates;
@using System.Text.RegularExpressions;
@using HtmlAgilityPack;
@model dynamic

<div class="cmscontent">
  @Html.Raw(TemplateUtilities.ParseInternalLinks(ParseMacros(Model.value.ToString())))
</div>

@functions{
    public string ParseMacros(string content)
    {
        var umbracoHelper = new UmbracoHelper(UmbracoContext.Current);
        
        var htmlDoc = new HtmlDocument(); 
        htmlDoc.LoadHtml(content);
        
        var macroHolders = (
            from div in htmlDoc.DocumentNode.Descendants("div")
            where div.Attributes.Contains("class")
            && div.Attributes["class"].Value.Contains("umb-macro-holder")
            select div
        ).ToList();
        
        foreach(var holder in macroHolders){
            // https://regex101.com/r/iG5cZ6/3
            string macroHtml = "<" + Regex.Replace(holder.InnerHtml, @"<!-- <\?(UMBRACO_MACRO(.*?))\/> -->", "$1") + "/>";
            var macro = HtmlNode.CreateNode(macroHtml);
            string macroAlias = macro.GetAttributeValue("macroAlias", "");
            
            if (macro != null) {
                Dictionary<string, object> parameters = (
                    from attr in macro.Attributes
                    where attr.Name != "macroAlias"
                    select new KeyValuePair<string, object>(attr.Name, attr.Value)
                ).ToDictionary(m => m.Key, m => m.Value);

                var macroContent = HtmlNode.CreateNode(umbracoHelper.RenderMacro(macroAlias, parameters).ToString());
                holder.ParentNode.ReplaceChild(macroContent, holder);
            }
        }

        return htmlDoc.DocumentNode.InnerHtml;
    }
}