Is there a way to get data about of Puppeteer's Promise?

Question

I'm working on my Master's thesis, that concerns Web Page Segmentation and I'm using Puppeteer to get data about visual elements in rendered web page. I've read a lot information about Puppeteer and how to assign data to variables scraped from page, but I've found no real solution for a problem.

async function process() {
    const browser = await puppeteer.launch();
    const page = await browser.newPage();
    await page.goto('https://en.wikipedia.org/wiki/Coronavirus');
    await page.waitForSelector('h1');

    const returned = await page.evaluate(async () => {
        const elements = Array.from(document.querySelectorAll('h1'));
        var h1Elems = elements.map(element => {
            var color = window.getComputedStyle(element, null).getPropertyValue('color');
            var bgcolor = window.getComputedStyle(element, null).getPropertyValue('background-color');
            var bbox = JSON.stringify(element.getBoundingClientRect());
            return {bbox:bbox, bgcolor:bgcolor, color:color};
        });
    
        return { h1:h1Elems };
    });

    console.log(returned); 
    browser.close();
}
process();

My question is: Is there way how to get data out of Promise, like this?

    ...
    console.log(returned); 
    browser.close();
}

var data = process().then(returned => {return returned});

I know, I can log it into console like this:

    ...
    console.log(returned); 
    browser.close();
}
process().then(returned => console.log(returned));

But I don't need it logged in console. I need as JSON to work with.

Thank you.