Hi Holger,
Thank you for your suggestion. We will track the customer demand here, and will consider providing the described enhancement based on the estimated interest and business value.
Meanwhile the developer can use the ItemTemplate to provide any desired content for the Drawer items:
https://www.telerik.com/kendo-angular-ui/components/layout/drawer/templates/#toc-item-template
Regards,
Dimiter Topalov
Progress Telerik