To read eBooks (mainly in EPUB format) in Chrome, the most convenient option is to install an extension from the Chrome Web Store, such as ePub Reader for Google Chrome™, which allows you to open files from your computer or Google Drive directly in the browser.
Find the extension: open the Chrome Web Store and search for “ePub Reader” or “ePub Reader for Google Chrome™”.
Install: add the extension to Chrome.
Open the file: click the extension icon, drag your .epub file into a new tab, or select it through the extension menu to start reading directly in the browser.