Lets say you are using a different website for your building needs and you decide you want to upgrade your site by using Webflow.
Now you can export pages off your current website to make rebuilding in webflow easier - Well why not go one step further.
There should be a way to upload .html files and it will automatically create pages for you and place all information in the page for you.
All you need to do is tidy it up a bit.
You could even make it place all image files into your assets folder.