express – Sending multiple JSON objects in the same response (ExpressJS)

I have

const students= require('../data/students.json');
const teachers= require('../data/teachers.json');

I followed the answer here Sending multiple responses(res.json) with the same response object in Express.js

and called

res.status(200).json({teachers: teachers}, {students: students});

But it only prints out teachers, not students. Am I overlooking something or doing something wrong?