I've created a new PR #407 containing the changes in the generator to generate the described new layout, that is visible @ liquibase-doc. All the elements can be styled separately from the liquibase.css
This one does not have binary dependency on core changes, although some property descriptions will be visible only after core PR #1002 has been merged. Nested properties `insert, update / whereParams` and `executeCommand / args` will be visible after core RP #992 is has been merged.
Regards,
Gyula Bibernáth