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Is it possible to use an environment variable in `pants.toml` with a default value?

The reason I am asking is because I want to add to `[cli.alias]` a command that with parameters that looks like `--profile-name %(env.PROFILE)s` . This environment variable is only needed in a few specific cases, but this requires  `PROFILE` to be defined for `pants` to run at all. Is it possible to set a default value for environment variables like this without requiring a developer to define all of them in their environment?

It is. Define them in .pants.bootstrap using bash syntax

See this for example <https://github.com/pantsbuild/pants/discussions/17633|https://github.com/pantsbuild/pants/discussions/17633>

The sourcing is done by scie-pants, so this is still supported.

thanks, Andreas! I've extended the docs <https://github.com/pantsbuild/pants/pull/20538>