my understanding (e.g. see this question Define features for Cargo profiles in Cargo.toml), is that it's not possible to set features based on cargo profile.
However there is an unstable cargo implementation for "profile-rustflags" https://github.com/rust-lang/cargo/issues/10271, which allows setting rustflags based on profile. rustflags can include --cfg feature="foo", so it seems that this will allow indirectly setting features based on the profile.
Is my understanding correct?