How do you enable intellisense for .uproject and .uplugin files?

When you watch some of the coding livestreams, such as C++ Plugin Based State Machine: Game Code | 01 | Live Training | Unreal Engine - YouTube intellisense/syntax highlighting is shown, even in the .uplugin file they are working on. How do I go about enabling this? I have copied the debugger visualization files into the relevant places, but all I see in the .uplugin file is the standard text.

Thank you

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