Create a Menu with a Label that uses a variable token in it's text, e.g [var:2]. This will be replaced by the content of the Global Variable with ID=2 (see Section 7.1 of the Manual), so if that Variable is a String, then you can set the Label's content dynamically by using the Variable: Set Action.
Then simpy set the Menu's Appear type to Manual, and enable it with Menu: Change state.
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Then simpy set the Menu's Appear type to Manual, and enable it with Menu: Change state.