How do I achieve a similar setup? What are the CMS/non CMS options?

Hi! I need to achieve something like this, while it would be cool to code this on my own, the simplicity of just using a CMS is tempting me...

But I'm curious to understand what the options might be.

The essential thing is that the website should be able to pull and post content from an external API, and then publish it in several places..

A newsletter integration would be ideal.

For moving on without a CMS I don't really know... I'm not really skilled with JS, I know a bit of Rust and well skilled with Hugo framework (static site generator), but this is not just some static content I have to manage..

For moving on with a CMS I would avoid the mess that is Wordpress, I've had a look at Ghost, it looks super nice and polished and love they have their own API you can call from elsewhere, the integrated newsletter feature, the publishing being done from more than a single user. But I need the ability to PULL content as well from an EXTERNAL already established content API, I didn't find anything on that online with Ghost..

Any suggestion on how to proceed, which tools to use?