Add a git package in the Unity Package Manager with target:
https://github.com/arfinity-io/unity-sassexecutables.git?path=/Package#v1.0.2
Add package with openupm-cli
npx openupm-cli add io.arfinity.unity.packages.sassexecutables
To use this package simply add it in the Unity Package Manager. This is a companion package to 'io.arfinity.unity.packages.sassimporter'