1. Very cool tool. Awesome work!

2. How would one go about practicing irl to be able to play in the style of the piano covers?

This is the style of piano I would love to be able to perform. I can read lead sheets and know music theory, but I just don't have the hand chops to perform. Every piano instruction book or tutorial I run across is based on developing progressive skills for classical performance. Pop style playing is distinct and I've never known how to progress my skills.