Verb:

কল্পনাবলে রচনা করা, উপন্যাসে রুপান্তরিত করা,

novelizer's Usage Examples:

He seems to have been the most prolific screenplay novelizer of the late '50s through mid '60s, and, during that time, the preeminent.

Sometimes the "novelizer" invents new scenes in order to give the plot "added dimension", provided.

English Library issued a prose adaptation of Pulman's scripts by career novelizer Martin Noble, under the title Jack Pulman's Private Schulz, with Noble.

writer, he seems also to have been the most prolific American screenplay novelizer of the late '50s through mid '60s, and, during that time, the preeminent.

probably safe to assume that Westheimer (at Miller's invitation) was the novelizer here too.