I tried creatina a simple entity, with @getters and @setters annotation.
The app was compiled, screens generated, etc., but at runtime I’ve got a “missing getter” error.
Adding manually getters and setters in the code solved the problem, so it seems that lombok was ignored.
Just as a side note: for all non JPA entity classes in a Jmix project it is perfectly possible to use Lombok. So any kind of POJO either for data transfer or for internal abstractions within business logic is not affected by this limitation.