goodwill ambassador

Translations
посол доброй воли
They were chosen as a goodwill ambassador to support humanitarian efforts.
Их выбрали послом доброй воли для поддержки гуманитарных усилий.
Definitions
A goodwill ambassador is a person, often a celebrity or public figure, who is appointed to promote a specific cause or organization, typically to raise awareness and support for humanitarian efforts, cultural exchange, or social issues.