On March 2019 DataStax Java Driver v4.0.0 was released, and my project should plan future migration to it, however I was not able to found any mentioning of object mapping as it was done in 3.x.x version.
I checked DataStax GitHub and JIRA and there is nothing that can help.
Is it going to be supported? If yes, can you share a link to the repository location?
It will be supported in driver 4.1. Please see this mailing list post, and the ticket in the open source Jira: https://datastax-oss.atlassian.net/browse/JAVA-2078