Directory Background in boot menu

[WEQA]

Boot menu contains many directories, every directory hold ISO files.
1.how can I set background to specified directory  in boot menu that contains iso files differ than them background.
For example, if I want to install windows 10, I should enter windows directory from boot menu, then the background should change to microsoft.
This feacher exist in grub boot.
2.how to write comment in json file.

[rahaaatul]

I want to know too. I want to change background for each image.

[AlexBryansk]

Look at the topic Big upgrade of "VentoyPlugson"(add parameters and Russian language). There is an example video there. This only works in the ventoy mod version. But I have already posted the mod-version sources on the gitflic server. I'll design a theme here later. If Mr. longpanda wishes, he will add these functions to the main branch.