Accessing environment variables from config.toml

help
1

Is there a way to access environment variables from the config.toml file?
Specifically, I'm looking for a way to set an env variable to be the current $CARGO_TARGET_DIR.
Right now I have in my config.toml:

[env]
MY_VAR={ value = "target/debug", relative = true, force = true}

But this obviously fails if the user is building with --release.
Ideally I want something like

[env]
MY_VAR={ value = "$CARGO_TARGET_DIR", relative = true, force = true}

but this doesn't work.
Thank you in advance for your help!

2

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