All TV operations with locally produced news and programming are in Spanish. There are local low-power TV stations that serve as the ABC and Fox affiliates but they have no local shows or news. CBS comes from a station in the nearby U.S. Virgin Islands, but again, there's no local news or programming. There's also a local PBS station that runs both English and Spanish programs but no local productions. And cable carries WNBC-TV, including its New York news and commercials, since there's no local NBC affiliate.
Puerto Rico is a big media market, but only if you're fluent in Spanish. There's plenty of local news and programming produced by five big TV stations but it's all in Spanish. There are three local daily newspapers, but all in Spanish.
As David points out, Puerto Rico's Anglo population is probably smaller today than 10 or 20 years ago. Where business people from the mainland used to get assigned to run local offices for U.S. and international companies, there are enough educated bilingual local people to do that now. When I stayed in a condo complex on the beach just outside San Juan, nearly all the local residents were educated, bilingual Puerto Rican professionals. I rented the apartment from a NYC couple, one of them Puerto Rican, one white. They used it as their vacation home and rented it out when they weren't there.
While News-Talk 1030 WOSO is the only 24/7 English-language radio station on Puerto Rico, you might try applying for jobs in the nearby U.S. Virgin Islands, which have a number of radio stations broadcasting in English, including FM Top 40, Urban and Classic Rock outlets. You can pick some of them up in Puerto Rico but their signals aren't great in San Juan.
I imagine the Virgin Islands stations wouldn't likely hire a mainland person flying down for an interview. My guess is, like most small stations, they hire local people, first parttime, then fulltime, as needs arise. If you really want to live and work there, you save your money so you can move there, take on some parttime odd jobs to support yourself, and introduce yourself to the local radio people so you're on their radar if an opening occurs.
But it would be harder to do in Puerto Rico because your options are so limited unless you could learn to speak Spanish pretty well. I do know an American woman, not of Latin background, who grew up in the NY area and learned Spanish in school. She moved to Mexico City, improved her Spanish, and got a production job with Televisa, the big Mexican TV company. But by then, her Spanish was good enough that should could work in a totally Spanish-speaking environment. So it can be done.