Take a look at grapesjs -- it's a bit janky in places but it's self hosted and overall works pretty well. It can output plain HTML so I think it could be integrated with vue.
The problem with that one is I want to completely avoid parsing/rendering HTML. That creates huge headaches when you want to create some kind of "component" but then once the html is rendered, it cant be re-parsed into its original state without adding a bunch of junk to it, like helper classes etc. It's just very brittle for what I want to do
