Attorney job for non Spanish speaker

Sorry no ideas, that would require contact almost exclusively with a small part of the population 2%. While around 20% of the population speaks some English, not all are fluent enough to fully understand an attorney. Also contracts and a lot of the legal matters are conducted in Spanish. You could try to be a corporate lawyer dealing with legal maters within that corporation but sooner or later you will have to deal with a Spanish speaker.

If you have no intention of learning Spanish I would not recommend moving to Puerto Rico, you will be isolated and unable to deal with a lot of day to day life.
Getting a driver license, buying a car, getting a doctor appointment, dealing with police, buying at a store, all will be more difficult without Spanish.
You can get a place to live in English speaking neighborhoods but when you get out of there, reality will hit you and your ability to communicate and get things done will be severely limited.

While PR is a territory of the US, it is a country run in Spanish and Spaniard culture.