How to instantiate dynamic implementations of a service using spring config

spring-dynamic-services.java

public interface MyService {
    String print();
}

@Service("service1")
public class MyFirstService implements MyService {
    @Override
    public String print() {return "service ONE";}
}

@Service("service2")
public class MySecondService implements MyService {
    @Override
    public String print() { return "service TWO"; }
}

@Configuration
public class MyConfiguration {
    @Autowired
    private ApplicationContext applicationContext;
    @Bean
    public MyService customServiceAlias(@Value("${my.service}") final String myservice) {
        return (MyService) applicationContext.getBean(myservice);
    }
}

@RestController
@RequestMapping("/api")
public class MyApi {
    private MyService service;
    public MyApi(@Qualifier("customServiceAlias") MyService service) {
        this.service = service;
    }
    @GetMapping
    public ResponseEntity<String> test() {
        return ResponseEntity.ok().body(service.print());
    }
}