unflatten support for databases with many tables

[YauhenPylAurea]

Hello,
There is an issue with having a lot of tables layout horizontally. And it seems it will be better to layout them vertically.
Example:

There is a tool within graphviz to unflatten graphs to improve layout aspect ratio.
It seems that current version of go-graphviz doesn't support it. Is there any possibility or a way to add such functionality (unflatten) to tbls?
Currently I see only one good way to do it by fork the implementation of go-graphviz and add unflatten as a tool. Later tbls will use the new version and allow using unflatten tool. Does it make sense? Or is there any other simple way? thanks

[YauhenPylAurea]

Added PR to go-graphviz - goccy/go-graphviz#56

[k1LoW]

The ability to specify table layouts would be welcome, and I would like to be able to add settings to the er: section.