I also think that this is not implemented. I wonder if there are some elegant workarounds?
If the Panel html exposes the user role, then I could use regular CSS to hide the content. (Not good for security, I know, but for the current simple use case, it could be a valid option.)
My current solution is rather hacky:
I have duplicated the blueprints folder, with some changes to the blueprints for editors/reviewers where certain fields is hidden. Then in the root index.php I check for the user role. If the user is editor or reviewer, then I change the path for the duplicated blueprint folder.
I works, but anytime a make some changes to the blueprints, I need to remember to adjust the duplicated blueprint folder also.