[Koha] How to contribute

Hello everyone! Im kinda lost as to where to ask this question so I decided to start here. Im interested in expanding Koha to have content such as book jackets and reviews that is either locally hosted or from a shared Koha content server. Would like to make this content server so that users of Koha could all contribute. i noticed that Koha is using Amazon for content now, is that something that is can be configured? Thanks for your time.