Thank you for reminding us @Andy.
We will look into it. Although, VS Code does not allow extensions to access files outside the workspace (we would have to work-around it and it would only work on some systems)
The recommended solution is to Add Folder to Workspace
. The IntelliSense should then parse the content of it as well.

Anyways; something like includepath
setting would be better I guess - we'll try to implement this as well.