Moshi Custom JsonAdapter - json

Question

I am trying to create a custom JsonAdapter for my JSON data that would bypass the serialization of specific field. Following is my sample JSON:
{
"playlistid": 1,
"playlistrows": [
{
"rowid": 1,
"data": {
"123": "title",
"124": "audio_link"
}
}
]
}
The JSON field data in above have dynamic key numbers, so I want to bypass this data field value and return JSONObject.
I am using RxAndroid, Retrofit2 with Observables. I have created a service class:
public static <S> S createPlaylistService(Class<S> serviceClass) {
Retrofit.Builder builder =
new Retrofit.Builder()
.baseUrl(baseURL)
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.client(httpClientBuilder.build())
.addConverterFactory(MoshiConverterFactory.create());
return builder.build().create(serviceClass);
}
I am calling this service using observable like this:
#GET("http://www.mylink.com/wp-json/subgroup/{subgroupId}/playlist/{comboItemId}")
Observable<Playlist> getPlaylist(#Path("subgroupId") int subgroupId, #Path("comboItemId") int comboItemId);
Then I run it like this:
ServiceBuilder.createPlaylistService(FHService.class).getPlaylist(123, 33);
My Pojo classes look like this:
public class Playlist {
#Json(name = "playlistid")
public Long playlistid;
#Json(name = "playlistrows")
public List<Playlistrow> playlistrows = null;
}
public class Playlistrow {
#Json(name = "rowid")
public Long rowid;
#Json(name = "data")
public Object data;
}
The problem is it would return a data value in this format:
{
123=title,
124=audio_link
}
which is invalid to parse as JSONObject.
I have Googled a lot and have also checked some Moshi example recipes but I had got no idea about how to bypass this specific field and return valid JSONObject, since I am new to this Moshi library.