The zeros would have to be inside the quotes to be effective, among other things. However, based on your reported error, this will probably cause problems no matter which way you go. I will try to explain.
If you are supplying a format that will contain text, you would use one format sequence. If you are showing digits, you would use a different format sequence.
Custom formats for numbers and currency fields in Access can be useful when you want the data displayed in a specific way.
support.office.com
Custom formats for text fields in Access can be useful when you want the data displayed in a specific way.
support.microsoft.com
But you are showing two different types of things in the format and further, the implication is that this is a bound field. If the underlying bound field is numeric, forcing it to contain text will lead to a type mismatch error because you cannot store text in a numeric field. Even if you could get it to display that way, the moment you tried to store the record it would fail because the underlying numeric field can't take that.
This "CHN\GO" sounds vaguely like a constant prefix. According to the normal ways of doing this in Access, you never store the constants in the field. Instead, you simply display them in a label when they are needed, and only store the numeric part in the underlying field.
So... tell us WHY you want this and perhaps we can find a way to get you closer to what you want.