If you want to run dotnet with globalization support, optionally to add dev-libs/icu as dep. Maybe to add optional use flags.
Run dotnet with globalization support without dev-libs/icu installed will get:
Process terminated. Couldn't find a valid ICU package installed on the system. Please install libicu using your package manager and try again. Alternatively you can set the configuration flag System.Globalization.Invariant to true if you want to run with no globalization support. Please see https://aka.ms/dotnet-missing-libicu for more information.