Amazon offered for some time under the name “Artist Central” the option to claim and manage artist pages itself.
However, this option is no longer available.
From Amazon's website: “Amazon has automated the creation and management of Artist Stores. As a part of this change we have closed external vendor and artist access to Artist Central. We will continue to create and support Artist Stores as well as manage artist discographies. Automated discography management facilitates a more streamlined process and ensures the accuracy of the pages. As part of the automation, we are conducting a test to measure the impact of removing non-discography assets currently in Artist Stores. As a result, additions or updates to images, banners, biographies, videos, Twitter feeds and other content in Artist Stores will no longer be supported. ”