Realtime: custom payload for clients

Hello I am using Realtime featuring GraphQL extension on postgres but as this thread mentionned it https://discord.com/channels/839993398554656828/962087531363565618
I doubt there will be support for Subscriptions over GraphQL. Thus said, is it possible to have custom data returned when pg dispatch a new event e.g INSERT with realtime ?

It would be helpful since there is no way for me to properly retrieve all of the data from several tables at once when using Realtime (unless i missed a section in the docs).
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