'VSCode: add settings.json KVP to keybinding?

How do I add the following KVP:

    "files.associations": {
        "*.*": "plaintext",
    }

as a keybinding in VSCode? The following isn't valid JSON:

    {
        "key": "ctrl+c f",
        "command": "files.associations": {
            "*.*": "plaintext"
        }
    }

Thank you!

visual-studio-code

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