I miss a widget to show the tasks of the day on the screen
Note that there is already an option in the Relevant Notes widget to only take notes from “Today”, so if you just want to see the notes listed, you can use that (see screenshot).
I guess you could be wanting a widget similar to the favorite note widget, which shows the content of a single note of your choosing, but where you can interact with a checklist, checking things off. Is that it?
Can you detail a bit more exactly what you would like to have?