What is a privacy friendly application that you'd love to have, but no one has developed yet?

A good note taking application kinda like Joplin but where I can draw over the text notes without having to draw in a separate program and then Import it as an image. I want to take notes while in class, so it should be fast to begin drawing.

Features:

• able to draw
• Sync with my other devices (Linux laptop and desktop) preferably via my nextcloud instance.
• Place images where I want and not just on its own line
• Supports latex or katex
• Syntax highlighting for code