Default value based on another argument

Question

Is it possible to define a default value for an argument based on another argument?

For example in the following code:

use clap::Parser;

#[derive(Parser, Debug)]
struct Args {
    #[arg(long)]
    name1: String,

    #[arg(long)]
    name2: String,
}

fn main() {
    let args = Args::parse();

    println! {"{}", args.name1};
    println! {"{}", args.name2};
}

I would like to have name2 use name1 as a default if it is not passed explicitly.

NOTE: My question is regarding whether it is possible (and how) to do that as part of the struct itself