The Read Aloud extension doesn't offer nearly as many options as Immersive Reader in Edge offers, but there are a few customizations that you can make to it. You can adjust the speed at which pages are read, the size of the text as it's displayed when being read aloud, and you can change the size of the text box that is displayed when a page is read aloud.
Watch this one-minute video to see how Read Aloud for Chrome works.