REST API capabilities for an existing data source

Hi all, I'm new to Retool and evaluating whether it can help my organization. I walked through their demo carefully which demonstrates how to build a simple data entry form and table which manages all of the CRUD operations. In that demo, they have you generate an API to interact & manage the underlying demo data source. Not knowing much about Retool yet, I'm wondering if it can generate a REST API against my existing data source. It's very simple, currently just one table. Or is that outside the scope of Retool? Looking at this post, I believe the answer is "No, this is outside of Retool's scope", but I just want to be sure I understand correctly. I appreciate the help in understanding its capabilities here. Thanks.