Hi Roel,
I think you used a datagrid in your example screenshot. When you use a listview you can add the rich text (rte) viewer widget to your list. This is not possible when you use a datagrid.
If you want to display html text in a listview, you need to use a widget that can interpret html. Maybe you can set the same widget to read only mode or use the html snippet from the marketplace, for example.