Unable to debug custom functions in JS-only runtime in Excel on Windows

[PavelVSmirnov]

I can start and see custom functions from the sample (Excel-Custom-Functions-JS) running in desktop Excel 2021 on Windows, but cannot debug them in that environment.

Trying from VS Code starting configuration "Excel Desktop (Custom Functions)".

Tried many different things with no luck.

I see the following strings in launch.json:
"type": "node",
"request": "attach",
"port": 9223,

But when Excel is up and running the add-in, and VS Code is trying to connect debugger, no process is listening on port 9223. Does this have something to do with my problem?