Call repository function in static function.

Describe the bug

I need user list in static function of controller.

export class NotificationController {
  constructor(
    @repository(UserRepository) public userRepository: UserRepository,
  ) {
  }

  public static async sendPushNotification(userId: string) {
    const userInfo = await userRepository.findById(userId, {fields: ['pushToken']});
    // send push code
  }
}

But I can not use userRepository and call repository function.
Is there solution for this?

Logs

No response

Additional information

No response

Reproduction

I write code

Start with the NotificationController example and the injected UserRepository usage shown in the issue. Determine whether static controller methods are expected to receive repository dependencies; done means confirming and documenting a supported way to access UserRepository from sendPushNotification.