Is it possible to use '＄' (double-bytes dollar) as a bind variable name?

Issue

I want to use '＄' (double-bytes dollar) as a bind variable name like the following

rule "GoodBye"
    when
        Message( status == Message.GOODBYE, ＄メッセージ : message )
    then
        System.out.println( ＄メッセージ );
end

and use java dialect, but rule compilation fails with the error messages like:

Rule Compilation error ＄メッセージ cannot be resolved to a variable

Is it possible to use '＄' (double-bytes dollar) as bind variable name?