Signed up just to add more weight to this request 
We do need the vector format export for obsidian canvas. It uses HTML and SVG under the hood anyway, why not make it available for using outside of Obsidian?
Use case or problem:
I myself drew a scheme in canvas and really liked the provided design and colours, so i wanted to embed it to my GitHub repo’s README.MD as a scalable picture, but was very disappointed to find out that only PNG export is available.
If it has some limitations and hard barriers for such export, i think people would still be happy to have at least something to work with and edit the provided SVG file themselves to achieve the desired result 