Spring Data Cache + Redis: How to avoid storing class names in serialized JSON which waste lots of space?

I am using Spring Data Cache using Redis as the cache manager. The config is like:

    return RedisCacheManager.builder(redisConnectionFactory)        .cacheDefaults(            RedisCacheConfiguration.defaultCacheConfig()                .serializeKeysWith(SerializationPair.fromSerializer(RedisSerializer.string()))                .serializeValuesWith(SerializationPair.fromSerializer(RedisSerializer.json()))        )        .build()

Let's imagine a very naive example using spring data cache:

@Cacheable(...)MyPOJO compute() { ... }

However, the RedisSerializer.json() is indeed a GenericJackson2JsonRedisSerializer. Thus, IMHO it will store things like {"hello":"world","@class":"com.my.name.some.package.MyPOJO"}. That @class: ... part is quite long and a waste of precious memory in Redis. Moreover, IMHO Spring Data Cache should be smart enough to realize that the value type is indeed MyPOJO, so it should not need to store that "@class".

Thus my question is: How to avoid storing class names in serialized JSON which waste lots of space, in Spring Data Cache + Redis CacheManager?

Thanks for any suggestions!