use multiple user and pass for auth in transport

[erfantmi9]

Hi.
I have an issue with using multiple user and pass for auth in transport parameter in mailer module.

@Global()
@Module({
  imports: [
    MailerModule.forRootAsync({
      inject: [ConfigService],
      useFactory: (configService: ConfigService) => {
        const MAIL_HOST = configService.get('MAIL_HOST');
        const MAIL_PORT = configService.get('MAIL_PORT');
        const EXPERT_MAIL_USER = configService.get('EXPERT_MAIL_USER');
        const EXPERT_MAIL_PASSWORD = configService.get('EXPERT_MAIL_PASSWORD');
        const path = require('path');

        const templateDir = path.join(process.cwd(), 'email-templates');

        return {
          transport: {
            host: 'smtp.gmail.com',
            port: MAIL_PORT,
            secure: true,
            auth: { user: EXPERT_MAIL_USER, pass: EXPERT_MAIL_PASSWORD },
            // tls: { rejectUnauthorized: true },
          },
          defaults: {
            from: '"Aspedan Expert" <[email protected]>',
          },
          template: {
            dir: templateDir,
            adapter: new HandlebarsAdapter(),
            options: { strict: true },
          },
        };
      },
    }),
  ],
  providers: [EmailService],
  exports: [MailerModule, EmailService],
})
export class EmailModule {}

this is my code and I need to use different values as user and pass for auth.
how can I handle this ?