I have tried this also, but I find it only so-so results. I do the Markdown export in Remnote, and then have to touch it up by hand or a custom Python script. Not scalable, or even easy, if aesthetics are important to you. I find that I prefer taking notes from PDFs in Remnote, and then pasting them (well, the Markdown export) into Obsidian, to have a local copy that I can further hack. I’m curious to see what others say and do.