Netlify-cms: JSON Widget

[IgorBelyayev]

Is your feature request related to a problem? Please describe.
The ability to save collection files as JSON files exists. However, there is no way to add nested JSON objects, nor is is there a way to add null values to a file. For example, if you paste JSON into a text widget, the resulting collection file contains a value for that text widget key which is a stringified version of the pasted JSON.

Describe the solution you'd like
A widget which supports JSON editing, and does not stringify the input upon saving.

Additional context
This seems like it might be a common use case so I'm wondering if I missed an existing solution.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[erquhart]

The code widget can do this: https://www.netlifycms.org/docs/widgets/#code