In reply to Anh Tran.

The problem is when will it available?

It should have been available at rollout to core. Unfortunately Gutenberg was included way too early in core. It should have stayed a plugin until all phases would have at least be defined in a very detailed roadmap including APIs defined and at least basically implemented.

With the current approach again and again breaking changes will be rolled out and plugins and themes have to adjust again and again and support many versions as not all users will upgrade always to latest core immediately.

Too bad that nobody seems to have seen this coming. :-(