What i need to do to replace PnP.Core.Services with CSOM for our Azure Function which uses .net 6.0

I have an Azure Function which uses PnP.Core.Services to interact with SharePoint to create a list item. The Azure function is based on .net version 6.0.

I have this startup.cs:-

using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using PnP.Core.Auth;
using System.Security.Cryptography.X509Certificates;

[assembly: FunctionsStartup(typeof(FunctionApp2.Startup))]
namespace FunctionApp2
{
    class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {

            var config = builder.GetContext().Configuration;
            var azureFunctionSettings = new AzureFunctionSettings();
            config.Bind(azureFunctionSettings);
            builder.Services.AddPnPCore(options =>
            {
                options.DisableTelemetry = true;
                var authProvider = new X509CertificateAuthenticationProvider(azureFunctionSettings.ClientId,
                    azureFunctionSettings.TenantId,
                    StoreName.My,
                    StoreLocation.CurrentUser,
                    azureFunctionSettings.CertificateThumbprint);
                options.DefaultAuthenticationProvider = authProvider;

                options.Sites.Add("Default", new PnP.Core.Services.Builder.Configuration.PnPCoreSiteOptions

                {
                    SiteUrl = azureFunctionSettings.SiteUrl,
                    AuthenticationProvider = authProvider


                });

            });

        }

    }
}

and this Function1.cs:-

using System;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Host;
using Microsoft.Extensions.Logging;
using PnP.Core.Services;
using PnP.Core.Model.SharePoint;
using System.Collections.Generic;

namespace FunctionApp2
{
    public class Function1

    {
        private readonly IPnPContextFactory pnpContextFactory;
        public Function1(IPnPContextFactory pnpContextFactory)
        {
            this.pnpContextFactory = pnpContextFactory;

        }
        [FunctionName("Function1")]
        public void Run([TimerTrigger("0 */5 * * * *")] TimerInfo myTimer, ILogger log)
        {
            log.LogInformation($"C# Timer trigger function executed at: {DateTime.Now}");

            using (var context = pnpContextFactory.Create("Default"))
            {
                var myList = context.Web.Lists.GetByTitle("SubFolders");
                Dictionary<string, object> values = new Dictionary<string, object>
    {
        { "Title", System.DateTime.Now }
    };

                // Use the AddBatch method to add the request to the current batch
                myList.Items.AddBatch(values);
                context.Execute();
            }
        }
    }
}

and this AzureFunctionSettings.cs:-

using System;
using System.Collections.Generic;
using System.Security.Cryptography.X509Certificates;
using System.Text;

namespace FunctionApp2
{
    internal class AzureFunctionSettings
    {
        public string SiteUrl { get; set; }
        public string TenantId { get; set; }
        public string ClientId { get; set; }
        public StoreName CertificateStoreName { get; set; }
        public StoreLocation CertificateStoreLocation { get; set; }
        public string CertificateThumbprint { get; set; }


    }
}

now i am working with a client and they do not allow us to use any open source technologies like PnP. so what i need to do to replace my above PnP code with CSOM code? and is there a CSOM code for .net 6?

Thanks