How to set theme?

[B.O.S.S]

Hello, I wanted to set custom theme by Ventoy Plugin but ventoy is still using own theme. Here is my configuration: On first partition (where are iso's) I have folder named ventoy, inside of it there is ventoy.json with content: 

Code:

{
    "theme": {
        "file": "ventoy/Vimix/theme.txt"
    }
}

Next to that file there is folder "Vimix" it's grub theme folder. That theme worked when i set it by changing grub.cfg in 2nd partition.
Here is also output of tree command from first partiton
What is wrong with my configuration?

Hi,

The path should not contains ventoy,  just use  "file": "Vimix/theme.txt"    and retry.

Thanks that worked but I think that this is incorrectly described on the page