In the comment of the blog below:
@sebersole wrote that the feature is planned for 6.0
I can’t find it in hibernate Jira and in the changelog of the alpha version.
Any updates about this feature? Is it still planned for 6.0? Already implemented?
It’s already implemented.
@beikov Where can I find documentation of this feature? Any chance it will be backported to 5.x?
6.0 is still a work in progress. You will find the documentation for this when we are finished, but we would be happy if you want to contribute that 
The method to create such joins is org.hibernate.query.criteria.JpaRoot#join(java.lang.Class<X>,org.hibernate.query.sqm.tree.SqmJoinType). This will most likely not be backported to 5.5 as that involves a lot of changes.
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