protected Integer getFakeContainerItemIndex() {
        return this.fakeContainerItemIndex;
    }
Getter for the {@code fakeContainerItemIndex} (may be null).

@return index of the container item on the generic field/method scope's declared type (e.g., in case of a List, it is 0)
@see #isFakeContainerItemScope()
jsonschema-generator/src/main/java/com/github/victools/jsonschema/generator/MemberScope.java