Format specifier, I want to change the color of the debug symbols

In this line:

println!("value of x: {:?} ok?", x);

I wish to change the color of :? or any debug symbol such as :x etc.

Currently you can see that the {:?} is all gray. But when I change it to :x

the x is red.

According to Developer: Inspect Editor Tokens and Scopes the x is a variable

When that is not true, it is a debug symbol.

Whereas :? is a format specifier.

I want to modify the debug symbol to another color. I want to all together modify the : and whatever comes after it such as a ?, x, b etc.

I know I have to put it under "editor.semanticTokenColorCustomizations" and under rules but not sure what is the name of the field?

Reproduce the Rust format-string examples from the issue in VS Code and inspect their semantic tokens and scopes. Trace how rust-analyzer classifies :?, :x, :b, and related format specifiers, then add a customizable token classification whose color can be set through semanticTokenColorCustomizations; done means each requested specifier can be styled distinctly.