Docs Image Zoomer is an extension for Google Docs which adds the ability to zoom images within Google Docs. This extension is free and very easy to use. But to use it, it needs Active Tab and Storage permissions.

To install it, you need to first enable the extension in the Chrome browser. Once it is installed, you will see a zoom icon at the top right corner when you hover over an image within a Google Docs file. Just click on the icon to zoom in and click on the close button or outside the image to zoom out. If you want to turn off this functionality, just go to the settings by clicking on the extension icon.