Large block storage with Objectify Appengine

I have this class that I want to save using Objectify, this class will represent data larger than 1 MB, so there is a list of Blob objects that contains a fragment of a byte array that is smaller than 1 MB:

@Entity
public class BigBlob {

    @Id
    private Long id;
    public static final int FRAGMENT_LIMIT = 777 * 1024;
    @Serialized
    private List<Blob> fragments = new ArrayList<Blob>();

    ...

}

However, @Serialized snippets that will display the size of this BigBlob class / object is larger than 1 MB.

Call this error:

com.google.apphosting.api.ApiProxy$RequestTooLargeException: The request to API call datastore_v3.Put() was too large.

If I use the @Embedded annotation, I get this error:

Cannot place array or collection properties inside @Embedded arrays or collections

How can I make sure that "fragments" are stored as a separate object?

By the way, I already have byte logic of bytes, which beats the entire array of bytes and puts fragments in Listfrom Blob, so this question does not relate to how to beat bytes.

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