I have no martial arts. Or learn it later. Is it possible to be a policewoman?

You don't need martial arts skills or the ability to fight to become a special police officer. Special police should learn military, tactics, driving skills, psychology, weapon use, fire fighting, politics, etc., involving all aspects. Fighting and grabbing are only a small part of it. Now is not the era of cold weapons, and the tasks that special police officers participate in generally use guns directly.

If you are determined to become a special police officer, what you have to do now is to study hard (or get your own michel platini) and fill out the voluntary application for the police academy, so as to enhance your physical fitness.

After that, it depends on your means and your nature. The water is deep.