Kanban plugin: board in board?

What I’m trying to do

Using the Kanban plugin, I would like to have stackable boards (see this link) but I have been unable to find any threads or mentions to it in the Kanban docs.

Things I have tried

I found one comment in a thread which said they were able to add YAML properties to a card to achieve this. When I tried this, it just corrected to:

[ ] ---
kanban-plugin: basic
---

Not sure if anyone has done this or knows another way. Please let me know!