Overview in notes would greatly benefit from having collapsible sections where you can expand / collapse part(s) of the note.
Example use cases in notes:
Shorter summary text or title, with collapsed details below.
An image, with a collapsed section below for more detailed content, whether images and/or text.
A list, with a collapsed more detailed sub-list, text or image(s).
The collapsed content could be within the note itself, or perhaps dynamically linked content from another note. This could enable structuring notes in a hierarchical way.
I'm imagining a neat graphical horizontal arrow-marker, that when clicked changes direction downwards and displays the collapsed section. Perhaps with a stretchable box with scroll bars so that one can decide how much visual space the expanded box should take.