Taken in stride with "Literature Notes should be written in your own words", I wonder if bullet points are sufficient.

Bullet point thoughts are the easiest point of entry in an outliner like Roam. But there is a cognitive benefit to putting things into complete sentences, and I could see that a re-usable, prose-ready literature note could be just as valuable as a permanent note (providing you can cite the lit note, of course).

This is why I think the Beau Haan Zettelkasten technique of creating a "thumbnail" summary on the parent block is a good fit with literature notes. You do all the messy "thinking through writing work" below, but leave the top block as something more cohesive.