Is it possible to have item topic in REST api response?

I’ve configured openhab with mqtt. In sitemap rest api i am getting all the items. I want mqtt topic with item from .items file.
How can i do this?
Is it possible to add customer parameter in sitemap response?

No. By design the the REST API, Rules, Persistence, and Sitemap only see Items. They never see, nor should they, anything associated with the specific binding the Item may be bound to.