Porting https://github.com/ros-perception/perception_pcl is a non-trivial effort. Especially it depends on some ROS2 core features that have not been finalized/ported to ROS2 yet. Example: Replace dynamic_reconfigure and its .cfg files, porting filter plugins to components, etc…
Did anyone contact the maintainers asking about their plans? I guess most people are waiting for ROS2 to be more mature to minimize code rewrite/throw-away, especially huge stacks like perception.