How to update globals from my decorator in "storybook": "^8.6.14",

[kristijorgji]

Summary

I have posted the full question with details at
https://stackoverflow.com/questions/79633809/how-can-i-update-storybook-global-theme-syncing

Shortly:
I added a custom globals named "theme" to storybook.

I want to know how can I update this dynamically and see the changed value in my custom toolbar item.
I need also my Preview decorator to read proper updated value on change so uses the correct theme (background color)

I have studied already existing documentations like
https://storybook.js.org/docs/essentials/toolbars-and-globals
They show how to update globals from an addon only. From decorator if I use useGlobals I get error that context provider is missing.

Also using

addons.getChannel().emit('globals:update', {
                globals: { theme: appTheme },
            });

does nothing, no changes happen.

Additional information

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