Would it meet your requirements if we added a @Option(showDefaultValue = true|false) attribute instead?

This would allow users to control whether default values should be displayed or not on a per-option basis, which is probably useful to have anyway, and would accomplish your goal of hiding sensitive information.

Example:

@Test  
public void testOptionAttributeShowDefaultValue() throws UnsupportedEncodingException {  
    @Command
    class Params {
        @Option(names = {"-p"}, description = "password", showDefaultValue = false)
        String password = "mypassword";
        
        @Option(names = {"-u"}, description = "user", showDefaultValue = false)
        String user = "guest";
    }
    String result = usageString(new Params(), Help.Ansi.OFF); 
    assertEquals(format("" +
            "Usage: <main class> [-p=<password>] [-u=<user>]%n" +
            "  -p= <password>              password%n" +
            "  -u= <user>                  user%n" +
            "                                Default: guest%n"), result);  
}

Feature request: mask default value #262

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