How to make a CriteriaBuilder join with a custom "on" condition?

It is possible starting from the version 2.1 of JPA using the on method Join<Z, X> on(Predicate... restrictions);

Here is how:

Root<Order> order = cq.from(Order.class);
Join<Order, Item> item = order.join(Order_.itemList, JoinType.LEFT);
item.on(cb.equal(item.get(Item_.type), 1));

I think this is the same problem as posed in this question. It looks like it is not possible in CriteriaBuilder. It is possible in Hibernate Criteria API, but that probably won't help you.

JPA Criteria API: Multiple condition on LEFT JOIN