Literary nonfiction (also known as creative nonfiction, narrative nonfiction or verfabula) is a type of writing that uses various literary techniques in order to create historically accurate narratives. It is written with florid language and for entertainment, which is different from other types of non-fiction writing such as journalism.
Literary nonfiction still retains biographical and historical data, and it tries to maintain factual accuracy. It does not contain supernatural elements, as it is still a form of nonfiction. However, it does rely on characterization for entertainment and to make the story more engaging.
There is no rule for a rhyme pattern, they can follow many different patterns, although maybe if you had a specific poem or type of poem there would be a rule.