There sort of is a note feature already in Shotcut.
Click on any file, then Properties.
There is a comments section. It’s not very large, but it works.
Not sure how much text you can fit in there. Only 4 lines will show with no ability to resize.
I’ve been using a stand alone notebook software called NoteTab Light. I’ve been using this for many years, with 3 tabs I use every single day. I’ve blurred the file names to hide sensitive information.
It’s basically a tabbed version of Windows Notepad.
