You could create another logical volume (lv) and then steal space from lv_home and give it to lv_data (or whatever you call it). But that is going to involve a good amount of work to make sure that nothing in the partition on lv_home is using that space (work I'm not rightly sure how to perform offhand).
It might be easier to simply change your mount points if you really don't care about /home and aren't going to care in the future. This would involve actually creating a /home directory on the / filesystem (on lv_root) then moving all of /home to there. After which you can mount the partition on lv_home to /data (once you've moved all your data to there from the current /data.
If this is a new system you might be better off just reinstalling from scratch and getting the partitioning and layout correct in the installation wizard.
Alternatively you could just move the contents of /data to /home/data and then symlink or bind mount from /home/data to /data.