My solution was to switch to Readwise.io and their “Official Readwise Plugin”. Kindle and other sources sync perfectly, with tags and metadata that I’ve chosen. Much better product.
Readwise.io is an excellent tool, you can choose which book/s are going to be synced. In my particular case and workflow, I prefer creating my tags directly on Obsidian. Each app is designed for different workflows and has its own fans.
On the other hand, this plugin gets the book’s ASIN and Amazon URL. There are also other interesting template variables - like: publisher, pages, publication and highlight.color - theoretically available.
I made some tests using this plugin (cloud’s way), however I’m still unable to retrieve some of them like: publisher, pages and highlight.color. Probably I’m doing something wrong.