Hi Ken. I already do this.

I've created "Numbered Tags" for example: "1. Recall Tips" and "2. To Process" and "8. My Chats" and I have "8. My Chats / Travel"

They're tags, but I use them like folders and nested folders.

And because they begin with numbers, they sit at the top of the Tag List.

Then when you do a chat, just click [+ Add to notebook] lower right under the chat. Then click [Open in notebook] and add the Tags to organize that chat wherever you want it.

Works a treat without any additional "folders" functionality that would probably cause confusion with users.