Is it possible to create "root" container for every workspaces

[L-Trump]

By chance, I found that execute layout toggle split twice would create a nested single container like this:

{
  "type": "workspace"
  "nodes": [
    "id": 20,
    "type": "con",
    "layout": "splith",
    "nodes": [{
      "id": 21,
      "type": "con",
      "app_id": "Alacritty"
    }]
  ]
}

Then every container operations (create/move/change layout) would happen in the top-level container (id=20 here). And some fancy tricks can be applied very simply. For example, move all windows in a workspace to another without change the layout:

swaymsg [con_id="20"] move container to workspace number 2

And then with some scripts, a pseudo full screen can be applied, simply by moving all windows to another workspace and moving the previous focused window back. This is also a interesting workaround for issues like fullscreen transparency.

So, is there a more native way to create such a "root" container for workspaces, or any workaround for it? Moreover, this seems to be a non-intrusive feature, perhaps there could be an option for Sway to implement such a feature?