fetch environment variable as a value in fastfetch

[GWLGT]

I know, the title seems weird, but, I'm working in my own fastfetch configuration, which based on the examples/19.jsonc preset, but, i have to fetch environment variable, like USER, as a value, like:

User: $USER (this should be the value of $USER environment variable)

how? can i do that?

[CarterLi]

In custom format {$USER}

Make sure you use the newest version

[GWLGT]

thanks!