The phrase "a person informed" is correct and usable in written English.
It can be used to describe someone who has knowledge or awareness about a particular subject or situation.
Example: "In discussions about climate change, it is essential to have a person informed on the latest research to guide the conversation."
Alternatives: "an informed individual" or "a knowledgeable person".
According to a person informed of the meeting with Mr. Bloomberg, the mayor did not encourage Mr. Lhota's candidacy.
Grand jury subpoenas were issued to a number of players and union employees over the last several weeks, according to a person informed about the process.
According to a person informed of Duncan's plans, Duncan and his wife, Amy, who had spent time with the Kidds in San Antonio, were trying to arrange to meet with Jason and Joumana before returning to Texas today.
However, a person informed of the discussions said Charles Bronfman was mulling how to put together a deal, including strategies like joining with Bacardi-Martini, the privately held owner of Bacardi rum, or with the owner of Absolut vodka, to which Seagram already owns the worldwide distribution rights.
A person informed of the demands, who asked not to be identified because settlement discussions are still under way, said Mr. Shipley wanted major changes in the way decisions would be made by the artistic directors, like doing away with consensus in favor of a majority.
Mr. Murdoch, the chairman of the News Corporation, will pay the asking price for the triplex apartment in a lavish co-op at 834 Fifth Avenue, according to a person informed of the deal, who asked not to be named because the contract had not yet been signed.
A reasonable person, informed about thisprogram, might well decide to applaud it.
A Turkish person informed me that the group we saw protesting was the youngest, most fundamentalist group, known for its violence.
The secret was revealed in a matter of hours, as an unknown person informed the press.
As an example, one person informed us that 5000 of the homicides came from police shootings.
The person informed an officer nearby, and a third victim was soon identified in the back seat.
