How do you find length inputValue EL Expression Builder in Page Composer?

Hello,

I want to disable OK button if value field length under 12. But EL Expression not acceptable #{bindings.CrossReference.inputValue.length()} .

How do you find length inputValue EL Expression Builder in Page Composer?

For example #{'Test'.length()} return 4, but #{bindings.CrossReference.inputValue.length()} not acceptable in expression builder.

Thanks,

Sevval