JavaScript static classes and methods

Help me solve this exercise:
Define a static method within the Person class which, given an object literal as input, instantiates a Person object

class Person {
  constructor(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
  }

  static fromObject() {
    
  }
}

const obj = {
  firstName: 'Mario',
  lastName: 'Rossi'
};

const person = Person.fromObject(obj);
console.log(`${person.firstName} ${person.lastName}`);

I have no idea! First time ever I add a static method to a class in JavaScript. I searched the internet but I still cannot solve it.