How to dock a new tool window to the left gutter?

[thakyZ]

I want to dock a new tool window to the left gutter by default, much like the default position of the Cookiecutter tool window or the Toolbox tool window?

I assume I need to use:

public override ToolWindowConfiguration ToolWindowConfiguration => new() {
  Placement = ToolWindowPlacement.DockedTo(new Guid("<unknown_guid>")),
};

However, I am unsure as to what GUID to use, and using ToolWindowPlacement.Floating or ToolWindowPlacement.Documentwell doesn't dock it the same way I want it to be docked.

And I am completely lost on how pages on the documentation like this one Contributions and configurations - Visual Studio (Windows) | Microsoft Learn gets the GUID for the "File in project context menu", the "Project context menu", and the "Solution context menu". Though I am unsure if ToolWindowPlacement.DockedTo(Guid) is what I actually need.