Toggle Server Group

How does this command work? Been trying to work out how to get this command working but I have no clue what to do with it, I want it to allow users in my server to toggle on and off a specific server group. It doesn’t seem to work like most other hotkeys, in that it has an extra step in the form of a line of text, and I cant work out the correct syntax for it. When clicking it in the hotkey menu it comes up with ;, does anyone know what to put in here?

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