The typical approach is to use a “glue service” to create, read, update, or delete your CMS info.
The tricky bit is knowing “which” CMS item you’d like to use.
Unfortunately Webflow only allows you to get CMS items by their autogenerated “item id”.
To get past that, the typical approach is to use Lookup Tables. If this whole process is of interest to you, here’s a tutorial that I’ve written in the past to help: