The phrase "announced in a declaration" is correct and usable in written English.
It can be used when referring to information or decisions that have been formally stated or made public through an official declaration.
Example: "The new policy changes were announced in a declaration issued by the government."
Alternatives: "stated in an announcement" or "proclaimed in a statement."
The timetable for new elections, announced in a constitutional declaration by interim President Adly Mansour on Monday evening, laid out plans to set up a panel to amend the suspended constitution within 15 days.
The move was announced in an Anglo-French joint declaration signed by the Home Secretary, Theresa May, during a visit to Calais, which is home to up to 5,000 migrants attempting to reach the UK.
And it prompted him to make a declaration that he had been planning for months: he announced, in an essay that he called "the lost chapter" of his memoir, that he is gay.
When Sen. Thom Tillis (R-N.C). announced in an op-ed that he would vote to disapprove of the emergency declaration, Trump didn't send a tweet.
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It was announced in the Declaration of Independence (1776) and defended in the "Federalist Papers" (1787-1788).
An acre of old forest or an acre of newly planted "forest?" So why celebrate the rate of deforestation announced in the New York Declaration?
As had been announced in the Cairo Declaration in 1943, Japan was to be reduced to her pre-1894 territory and stripped of her pre-war empire including Korea and Taiwan, as well as all her recent conquests.
In May 2016 the government – pathetically – announced a declaration of emergency across all Madre de Dios because of mercury contamination.
This is what happened when the site announced a declaration of war on spam in October last year: Sophos also say the iTunes 10 update fixes 13 "separate vulnerabilities" in the components used to render the iTunes interface.
