Scriban Embedded function to get List of Categories

AddCategoryFunction.cs

using System.Collections.Generic;
using System.Linq;
using MyProject.Models;
using Scriban.Runtime;
using Sitecore.Data;
using Sitecore.Data.Items;
using Sitecore.XA.Foundation.Scriban.Pipelines.GenerateScribanContext;

namespace MyProject.Pipelines.GenerateScribanContext
{
    public class AddCategoryFunction : IGenerateScribanContextProcessor
    {
        private delegate List<CategoryModel> GetCategoriesDelegate(Item currentPageItem);
          

        public void Process(GenerateScribanContextPipelineArgs args)
        {
            args.GlobalScriptObject.Import("sc_article_getcategories", new GetCategoriesDelegate(GetCategories));            
        }

        public List<CategoryModel> GetCategories(Item currentPageItem)
        {            
            List<CategoryModel> articleCategories = new List<CategoryModel>();

            // Perform your code logic here

            return articleCategories;
        }       
    }
}

MyProject.Feature.Scriban.config

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/" xmlns:role="http://www.sitecore.net/xmlconfig/role/">
	<sitecore role:require="Standalone or ContentManagement or ContentDelivery">
    <pipelines>
      <generateScribanContext>        
        <processor type="MyProject.Pipelines.GenerateScribanContext.AddCategoryFunction, MyProject" resolve="true" />
      </generateScribanContext>
    </pipelines>
	</sitecore>
</configuration>