I've seen this posted in 2014, and 2016, and now it's 2019. It's obviously a feature people will use.

Allow me to drop code blocks into sections of my page, so that I no longer have to do it manually, post-export, every single time I make an update. This would be really useful for adding permanent alterations like OG properties, tracking code that I use to monitor my websites performance and search-ability, and adding forms (all of which I now have to drop in manually).

Not having this turns a simple website update from a 60-second process into a 15 minute+ process, depending on how many pages I've modified.

Why isn't this a thing, yet??