Currently

To add compatibility I need to write in BuiltinCompat.java the ID of the chain item.

What I would like

I would like to use a tag system instead. But this turned out rather difficult as currently the types are made on startup.
The tag system would need to work as data pack and needs to be able to be reloaded while the game is playing.
Additionally, server and client need to sync this data, when you join server A, it might have a different set of valid chains (including textures)