Knowing how the handle and bounce works are the first things to gain familiarity with for hitting these lob shots. Here's how you practice that.
Now that you know the most important patterns to the L to L, here's how to turn that into a full swing.
When you find drills that help you, integrate them into your practice swing. Here's how to blend it all together.
The first pattern hinges your right arm. This trains your body to use the momentum.