Confusion about nested workspace setup

[cprass]

Hi folks, I'm quite new to Deno and the VSCode plugin and I have problems setting this up correctly in a monorepo with some folder nesting.

Here is an example repository

Consider this repository setup:

<root-folder>
  - [deno]
    - [example-project-a]
      - import_map.json
      - ...
    - [example-project-b]
      - import_map.json
      - ...
  - [nodejs]
  ... other folders

I am currently trying out Fresh and all I did was create the initial Fresh scaffolding. Now when I open the components/Button.tsx file, VSCode shows me a bunch of errors:

For example the preact import is supposedly not found but this is clearly defined in the import_map.json.

Config setups I tried so far

1. VSCode settings in the deno project folder with "deno.enable": true
2. VSCode settings in the deno main folder with "deno.enable": true
3. VSCode settings in the root folder with "deno.enablePaths": ["./deno"] or "deno.enablePaths": ["./deno/project-folder"]

Could someone please point me in the right direction of how to approach this?