If I understood your question you need to specify in your controller which bearer token you are using. In your case:

// swagger config
...
const config = new DocumentBuilder()
    .setTitle('SWAGGER API')
    .setVersion('1.0.0')
    .addBearerAuth(
      { 
        // I was also testing it without prefix 'Bearer ' before the JWT
        description: `[just text field] Please enter token in following format: Bearer <JWT>`,
        name: 'Authorization',
        bearerFormat: 'Bearer', // I`ve tested not to use this field, but the result was the same
        scheme: 'Bearer',
        type: 'http', // I`ve attempted type: 'apiKey' too
        in: 'Header'
      },
      'access-token', // This name here is important for matching up with @ApiBearerAuth() in your controller!
    )
    .build();
...

and in your controller:

@Get('/some-route')
@ApiBearerAuth('access-token') //edit here
@UseGuards(JwtAuthenticationGuard)
getData(
  @ReqUser() user: User,
): void {
  this.logger.warn({user});
}

Shortest way I have found is to do the following:

export function Headers() {
  return applyDecorators(
    ApiHeader({
      name: 'header1',
      description: "description"
    }),
    ApiHeader({
      name: 'header2',
      description: "description"
    }),
    ApiHeader({
      name: 'header3',
      description: "description"
    })
  );
}

@Headers()
@Controller('some-controller')
export class ContactsController {}

to make headers optional you can use @ApiHeader() decorator in your controller's route.

@Get()
@ApiHeader({
    name: 'x-skip-cache', // your header name
    required: false, // Set required to false to make it optional
    description: 'Optional header to skip cache',
  })
 async getLocationsData(
    @Headers('x-skip-cache') skipCache: string = 'false',
  ){}