Map<String, String> quantities = new HashMap();

List<WebElement> listquantities = driver.findElements(By.xpath("//foo"));

for (WebElement line : listquantities) {
            quantities.put(line.findElement(By.xpath("//bar")).getText(), line.findElement(By.xpath("//baz")).getText());
}

return quantities;

let locations = await element.all(by.xpath("//foo//bar")).getText().then(function (text){return text})
let quantities = await element.all(by.xpath("//foo//baz")).getText().then(function (text){return text})

const listquantities = $$(‘foo’);
const quantities = await listquantities.map(async line => {
  return {
    [await line.$(‘bar’).getText()]: await line.$('baz').getText()
  }
})