如何将TOML配置文件中的字符反序列化为crossterm::event::KeyCode？

[dependencies]
serde = "1.0"
serde_derive = "1.0"
toml = "0.5"

use serde::Deserialize;

#[derive(Deserialize)]
struct Config {
    key_code: crossterm::event::KeyCode,
}

use std::fs::File;
use std::io::Read;
use toml::from_str;

fn main() {
    let mut file = File::open("config.toml").expect("Failed to open config file");
    let mut contents = String::new();
    file.read_to_string(&mut contents).expect("Failed to read config file");

    let config: Config = from_str(&contents).expect("Failed to deserialize config");

    // 使用反序列化后的数据进行后续操作
    let key_code = config.key_code;
    // ...
}