I use Raindrop.io to read and highlight web articles and use the copy button at the bottom to copy into Obsidian. It’s already in a kind of markdown format suitable for my notes, the title at the top, then the URL and then one bullet point per highlight.
There is also an API for the highlights so somebody could probably build an Obsidian integration. It would be easier though with a Capture QuickAdd that converts the copied highlights into a properly formatted note.