Environment variables - Noksa/Allure.NUnit GitHub Wiki
You can add both constants and system/CI server variables in this way:
- Constants:

- Runtime variables in
environment.runtimeblock, syntax:Namespace.ClassName.MemberName:

Works with public/internal/private static fields, static properties and with constants.
- System or CI server variables in
environment.runtimeblock, syntaxSystem.Environment.NameOfVariable:
Example of Environment widget in the report with variables: