[Feature Request] Improve json format

[jwillmer]

If a webhook returns a complex JSON it would be very useful to be able to collapse parts of the JSON.

Pages like jsonbeautifier.org do this for you and it looks like this:

I found this implementation of a collapsible-tree-structures-from-json that could be used as a starting point.

[xenowits]

I will be working on this @fredsted