Get and display item from list<Item> in Thymeleaf template

Question

I have an HTML5 page using Thymeleaf templates.
The Java controller has a ModelAttribute of a MyData which is a List of MyItems via a service class.

@Controller
public class MyController {

    private final MyService myService;

    @Autowired
    public MyController(MyService myService) {
        this.myService = myService;
    }

    @ModelAttribute
    public MyData myData() {
        return myService.getMyData();
    }
}

I don't want to loop through the data in a for:each loop and display the data as I am not displaying it all in a table. There are many examples of this around.

I need at various points in my form to find particular items from the list and display some fields from the located list item.

The item should be located using 2 values <th:thisItem = getMyItem(param1,param2)> and then reference thisItem.fieldX to display the data on the form.

I know I have the list referenced via the ModelAttribute as myData to the form, but how can I find a specific item.

Thanks

ps. I don't want to use jsp pages