remap `fn` key in MacOS Terminal.app for `tmux`

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I use macOS Sierra Terminal.app with tmux. When I want to disable Allow mouse reporting temporarily to copy/paste and clicking I need to press the fn key which is far away in my long apple keyboard. Is there a way to change this fn key to a closer key like alt or shift? I could not seem to find how after googling for a while. Thanks!

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