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Is it like this plugin to display the upper and lower documents? https://github.com/OpaqueGlass/syplugin-my-plugin-collection/blob/main Or do you want to implement other styles, I'm not quite sure what you mean

This is exactly what I am trying to do too.

Perhaps you could check out the plugin linked below, which has four different outlines that can be inserted as blocks, and see if it meets your requirements.
https://github.com/TinkMingKing/siyuan-plugins-index
I'm not a native English speaker, so please forgive me if I misunderstood.

By the way, HistoryNavigate plugin from link above is just something like that (not 1 to 1, but feels ok). So it is possible to fork this and implement, I guess.