You can override the settings used to construct the ObjectMapper using the properties defined by the class in application.yml.

Example Jackson Configuration

As an example, the following snippet is taken from Micronaut’s native Eureka client (which, of course, is built using Micronaut’s HTTP client):

@Client(id = EurekaClient.SERVICE_ID, path = "/eureka", configuration = EurekaConfiguration.class)
@JacksonFeatures(
    disabledSerializationFeatures = WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED,
    enabledDeserializationFeatures = {UNWRAP_ROOT_VALUE, ACCEPT_SINGLE_VALUE_AS_ARRAY}
public interface EurekaClient {

The Eureka serialization format for JSON uses the WRAP_ROOT_VALUE serialization feature of Jackson, hence it is enabled just for that client.