This was actually very intentionally not added to the loot filter and as of right now, we don’t have any plans to add it. We really like the time between an item dropping and looking to see if it’s really fantastic wtf awesome or just good. Having LP be something that can be filtered for would remove this. It’s not completely off the table and we will continue to monitor things post patch but it’s not looking good for it to be added.
Edit: same with Forging Potential.
Edit 2024: wow this post is sure looking stale. A lot has changed recently eh? I’m not going to change the post though because it was right for the time.