Give field in struct another valid name when parsing

I want to use this crate to parse a toml config file. This is part of my current code:

#[derive(Deserialize)]
pub struct ConfigRawFile {
	command: Option<String>,
	interval: Option<f64>,
	fg: Option<String>,
	bg: Option<String>,
	fg_cursor: Option<String>,
	bg_cursor: Option<String>,
	bg_selected: Option<String>,
	bold: Option<bool>,
	bold_cursor: Option<bool>,
	keybindings: Option<KeybindingsRaw>,
}

fn parse_toml(config_file: &str) -> Result<ConfigRawFile, config::ConfigError> {
	config::Config::builder()
		.add_source(config::File::with_name(config_file))
		.build()?
		.try_deserialize()
}

However, I want to give e.g. bg_cursor a different name that should be read from in the toml file. I would like the toml file to specify "bg+" (which I can't use as a variable name in rust due to the +), and then read that into bg_cursor. Is there an annotation I can use for this (similar to #[arg(long = "bg+", value_name = "COLOR")] in clap)? This would be very useful!
Thanks!

Start by tracing Config::builder().build()?.try_deserialize() and how ConfigRawFile fields are passed to deserialization. Determine whether field aliases can be supported for keys such as "bg+" while retaining bg_cursor in Rust, then add regression coverage for the requested mapping and verify existing configuration formats remain unaffected.