If you want to make a web app that can communicate with the Lume Pad’s DLB backlight to enable Lightfield mode, you should use the Leia WebGL SDK. This alone won’t require submitting anything to the Appstore.
If you wanted to release an app for Lume Pad that opens Chrome to the website you’re building, that might be a possibility, but we only accept native apps that have Lightfield capabilities into the Appstore. We’d probably have to work with you to see what makes sense for users.