Add element in the toolbar

[hasm1k]

hello,
I have created a SampleToolbarDefaultsOverride function (SampleToolbarDefaultsOverride: () => DeflatedToolbarTree) and successfully rebound the ToolbarDefaultsFactory with it to add elements to the toolbar. Now, I need to add a new element based on a configuration retrieved from a command-line argument(I have command line argument service to be able to get the arguments from fronend). If this configuration is enabled, I want to add the element to the toolbar.

However, I'm unsure how to update the DeflatedToolbarTree(SampleToolbarDefaultsOverride) based on the configuration. How can I do that ?