Symone D. Sanders, a former adviser to President Biden. (NBC News also has separate digital offerings for hard news and lifestyle coverage.)

For news executives, finding a winning formula in the streaming game is now an urgent priority.

Streaming has supplanted cable as the main home delivery system for entertainment, often on the strength of addictive series like “Squid Game.” For a while, though, old-fashioned cable news clung on, with CNN, MSNBC and Fox News attracting record audiences in recent years. In case of emergency — a pandemic, civil unrest, a presidential election, a Capitol riot — viewers still tuned in en masse.

After former President Donald J. Trump left office, news ratings nose-dived and cable subscriptions continued to plummet — an estimated four million households dropped their paid TV subscriptions last year, according to the research firm MoffettNathanson.

Fox Nation and CNN+ both rely on a business model dependent on paid subscriptions, hence the efforts by both to generate a wide variety of programming.

“A subscriber every month only has to find one thing that they want,” Mr. Zucker said in the interview. “We don’t need the subscriber to be interested in everything we’re offering, but they need to be interested in something.”

Mr. Zucker said CNN+ was aiming at three buckets of potential subscribers. He is seeking to entice loyal CNN viewers into paying for streaming programs featuring hosts familiar from the cable channel: Anderson Cooper will have two, including one on parenting; Fareed Zakaria is helming a show examining historical events; and Jake Tapper will host “Jake Tapper’s Book Club,” in which he interviews authors.

The other would-be subscribers, Mr. Zucker said, are news and documentary fans who want more nonfiction television, as well as younger people who don’t pay for cable.

CNN, though, is not ignoring the needs of its flagship cable network, which ranked third last year behind Fox News and MSNBC in total audience.

Mr. Zucker recently reached out to representatives for Gayle King, the star CBS News anchor, about the prospect of her taking over the weekday 9 p.m. hour on CNN, said two people with knowledge of the approach. CNN has not named a permanent anchor for the prime-time slot since Mr. Cuomo was fired in December after revelations that he assisted with the efforts of his brother, former Gov. Andrew M. Cuomo of New York, to fend off sexual harassment allegations.

CNN+ is also expected to include the breaking news and political coverage that CNN viewers are accustomed to — a feature that could pose difficulties for the network down the road. CNN commands a high price from cable distributors, who may cry foul if CNN+ includes too much news programming that potentially competes with the cable offering. For instance, Wolf Blitzer, the host of “The Situation Room” on CNN at 6 p.m., will also appear on CNN+ to anchor a “traditional evening news show with a sleek, modern twist.”

CNN’s parent company, WarnerMedia, which is on the verge of a megamerger with Discovery Inc., appears willing to take the risk. The company is placing a significant financial bet on CNN+, budgeting for 500 additional employees, including producers, reporters, engineers and programmers, said Andrew Morse, CNN’s chief digital officer. The company is also renting an additional floor of its headquarters in Midtown Manhattan to accommodate the hires.

“What we’re building at CNN+ is not a side hustle,” Mr. Morse said.

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