Work in progress zed theme.
I wrote a small helper application to substitute variables in the theme file. You can check it out in the phisch/variable-substitutor repository.
Here is a quick guide on how to use it:
git clone git@github.com:phisch/variable-substitutor.git
cargo build --release --manifest-path variable-substitutor/Cargo.toml
./variable-substitutor/target/release/substitutor -o ~/.config/zed/themes/phine.json themes/phine.json -w