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literariness

n. The property of being literary, either being a work of literature or knowledgable of literature.

Wikipedia
Literariness

Literariness is the organisation of language which through special linguistic and formal properties distinguishes literary texts from non-literary texts (Baldick 2008). The defining features of a literary work do not reside in extraliterary conditions such as history or sociocultural phenomena under which a literary text might have been created but in the form of the language that is used. Thus, literariness is defined as being the feature that makes a given work a literary work. It distinguishes a literary work from ordinary texts by using certain artistic devices such as metre, rhyme, and other patterns of sound and repetition.