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screenplay, even one nominated by the Academy is not publishable as a novel. Few people would purchase a copy of a screenplay for a good read.
Other than the directing instructions, the story content of a screenplay is essentially a subset of a manuscript. Both have a hook, characters, dialogue, a problem, a goal, conflicts, a climax, character growth and an ending. In addition to this, the manuscript has narratives which elaborate on the setting, the backstory, the characterization, the action and the emotional depth. Without these, a screenplay is mostly dialogue. In a manuscript, dialogue typically comprises 40% to 60% of content.
Therefore, the project is basically to approach the dialogue of the screenplay like the plotting or the skeleton of the story. To this, narratives consisting of the missing elements are fleshed or layered in.