Can you tell me how to package an existing web app online with a hybrid app?

As the title suggests, to use a real smartphone device, a program developed as a web app, I'm going to hybridize the existing code If you look at the phone gap or the hybrid app, it is confusing because it is completely different from the process of creating the project.

The existing code was created as a web project, not as an Android project I made a project so that it can be seen on the mobile web, but I brought the existing code Can you tell me how to use a smartphone device, make it into .apk, and upload it to the Android store?