Yes it's possible, you will have to create a cloud function in Cloud Backend and call your external API
You can then call your cloud function to fetch the content and display it in the frontend. For that part you will need to write some JS to generate the elements and add them on the page.

In cloud backend > API > Create a new function > Node.js
there you will see several cloud function templates, one of them is about calling an external API

We don't a tutorial for this exact use case but you will learn a lot by checking our video tutorials here:
https://academy.appdrag.com/

Another option is to use Dynamic Datasource instead but that option might be more limited for your use case.
this is covered by Tutorial 5 here:
https://academy.appdrag.com/FullStack-with-cloud-backend-Episode-5.html