The Jakarta REST 4.0 specification has been finalized and the API released to Maven Central. The API and RESTEasy implementation should be updated in WildFly Preview for Jakarta EE 11.

RESTEasy Tag: https://github.com/resteasy/resteasy/releases/tag/7.0.0.Alpha1
Jakarta REST Tag: https://github.com/jakartaee/rest/releases/tag/4.0.0-RELEASE