In Chrome (Canary), a flag called "Tab Hover Card Images" is present which enables tab previews, as shown here:
Here's a preview of the flag:
However, this flag is missing from Microsoft Edge (Chromium):
Since Microsoft Edge has always have tab previews present since its inception, so it would be great if Microsoft Edge (Chromium) also has this flag present. Or rather, this flag should be enabled by default.
@Jacques Van de Meerssche - That's a different flag and it doesn't generate tab previews. You can see that flag in the screenshot I attached in my post.
The tab preview can only be enabled with the "Tab Hover Card Images" flag. The same flag is present in Brave as well, which is also based on the Chromium project, and Opera and Vivaldi have their own tab preview functionality. So, I am not sure what's stopping the Microsoft Edge team from including that flag or introducing an alternative when the original Edge has supported it for a long time.