I really like this idea, I envision something where this would be made possible on browsers now. This could only happen after further consideration about the security implications of localhost html files using secure context apis like indexeddb and localstorage The powers that be would rather turn this concept into a mArKetPlaCe -- Just let us create! Why must we always kneel before the altar of capitalism?
I experimented a bit with the concept to build my resume, I had naively been using gatsby a while back. "Just use a plain html file!" - It was a real "duh!" moment. You just edit the embedded markdown then viola. Want a pdf? Press cmd+P