The goal is to have an hover behavior on tab block (cf: Create a Mega Menu with Category Images - #2 by Araminta)
Found another example of hover in mega menu : Framework | Framework Laptop 13, now with AMD and Intel options, and
Thank you for sharing this feature request!
This has been added with 18.104.22.168.4.
So you should now be able to achieve your desired mega menu effect.
You guys are the best