It is possible to debug your own nuget packages using symbols in *.snupkg files. Visual Studio gives you the possibility to setup Symbol Servers such as Azure Devops Artifacts.
Here's example how to do it in Visual Studio: https://devblogs.microsoft.com/visualstudio/debugging-external-sources-with-visual-studio/
Is it possible to do something similar in VS Code as well?
I'd expect a functionality of step into method that comes from a package created in a separate solution.