How to read json as a string from a yaml file in spring boot application ?

I need to get the json as a string / json object.

Application.yml

Shirt:
 rest:
  booking:
   invoiceAddress: {"name":"VIA Pics AB","address1":"VIA Pics AB","address2":"Mejerivägen 3","zipCode":"11743","city":"STOCKHOLM","countryCode":"SE","email":"w.ho@Pics.fr"}

Configuration class

@Configuration
public class ConfigurationServiceClientConfiguration {

    @Value("${Shirt.rest.booking.invoiceAddress}")
    private String invoiceAddress;

    @Bean
    public String getInvoiceAddress(){
        System.out.println(invoiceAddress);
        return this.invoiceAddress;
    }
}

Also tried @JsonProperty but no idea whether my usage was wrong or not !

Note: I am not ready to change the json as a list because more jsons (of invoiceAddress) to come and I will have to make list for each. So it's easy for me if the json can be copied as it is to the yaml file.