Puppeteer CDPSession Send Expression Multiple Values

Question

I'm using this bit of code that is working for its purpose of setting one localStorage value, but am unsure how to apply multiple values using this method. Searching for documentation has lead me many places without clear answers.

const browser = await puppeteer.launch();
browser.on('targetchanged', async (target) => {
  const targetPage = await target.page();
  const client = await targetPage.target().createCDPSession();
  await client.send('Runtime.evaluate', {
    expression: `localStorage.setItem('hello', 'world')`,
  });
});

Specifically, how can I set hello2, hello3, etc... within the expression?

expression: `localStorage.setItem('hello', 'world')`,