Not sure if this helps but Decap-CMS lets you define your own records with fields, like a shopping product record with a price field and Markdown/HTML description, where the content is saved to Git in simple JSON/YAML data files. You can then edit the records via the browser web interface, which commits changes to Git and your static site generator would build the site from the data files.

Decap-CMS demo here: https://cms-demo.netlify.com/#/collections/posts