Here are the current Philippine senators who have education or career backgrounds related to politics, public administration, law, governance, or public service:

Senator Politics-related background
Alan Peter Cayetano Law degree; former vice mayor and representative, plus diplomacy and public office experience.
Francis “Chiz” Escudero Law degree; former representative and governor.
JV Ejercito Former mayor and representative.
Joel Villanueva Former representative; public service and labor policy background.
Risa Hontiveros Former party-list representative; long public-policy and social advocacy work.
Win Gatchalian Former representative and mayor; governance and legislative experience.
Bam Aquino Public policy and social entrepreneurship; no prior elective office, but strong governance/policy background.
Loren Legarda Former representative; long career in public service and policy work.
Pia Cayetano Former representative; law and policy- oriented public service background.
Jinggoy Estrada Former vice mayor and mayor; long local-government experience.
Robin Padilla No formal politics-related degree, but now serves in the Senate and has a public service role.
Ronald “Bato” dela Rosa Public-service and security leadership background, especially in law enforcement.
Bong Go Former special assistant to the president; close executive-branch experience.
Lito Lapid Former governor and vice governor; strong local-government background.
A few names are **more directly politics-related** than others because they studied law, public administration, or worked in elected office before the Senate. The most clearly politics-oriented among them are Alan Peter Cayetano, Francis Escudero, Pia Cayetano, JV Ejercito, Win Gatchalian, Jinggoy Estrada, Loren Legarda, and Joel Villanueva based on their prior public office or policy careers.

Quick note

The Senate roster changes over time, so this list reflects the current membership shown in the source I used. If you want, I can also turn this into a cleaner “education only” list or a “had prior political office” list.