includeListItems = true in the ProvisioningTemplateCreationInformation

[web265p3]

I know that there is the extraction configuration and I can use this with Powershell like explained here.

However, in C#, there seems to be no option for this. If I want to create a template this looks like that:

            using (var context = authManager.GetContext(groupSiteUrl))
            {
                ProvisioningTemplateCreationInformation ptci = new(context.Web)
                {
                    
                };

                var template = context.Web.GetProvisioningTemplate(ptci);
             }

The ProvisioningTemplateCreationInformation does not contain many of the configuration options available like in the XML file.
For example: How could I add a setting that the items of a list should be included in the template?

I am talking about this point:

How could I set this point to true for a list in my code above?