"output" modifier respected for structure members

[ChristianHansen]

Describe your request It would be great if the output modifier were respected for members of structures. For example, at https://github.com/LiveRamp/api-specs/pull/317/commits/1962b6651809ad8a54ef2080926f6c8bb792be69#diff-9942bbda67953cfa58e0b3b375485e249e726f7dc54ed0fe48aebfa3e2ec67fcR266 I added the optional modified to a structure member already flagged with output so that the member wouldn't be required.

Describe the value this feature would provide This makes it easier to differentiate between what a caller should or shouldn't POST, PUT, or PATCH for more complex resources.