That's awesome for dev and UX feedback. It w. It follows the trend that the tool only exports into a human readable format and that's more than enough.
The UI or the interpretation of the JSON can be built later on.

Uxnote is an annotation bar for mockups and websites. Drop a single script to get text highlights, element pins, numbered cards, color theming, a dimmed focus mode, import/export, and email handoff. No plugin and no backend required.

It's similar to https://loomflows.com/ but minimalistic and provide full-control over the data.