Triggered when the value of a variable changes

please tell me how to set up a trigger so that it is triggered when the value of a variable changes?

No idea what you mean by that.
You need to provide more information, what you want to do, when you want to do it and so on.

I want the workflow to be triggered when a variable in the record block is changed

Then you need an afterUpdate compose record trigger and check oldRecord value of the variable is different than the new record variable. There is a bunch of this information in the docs

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