This is how to compile `outbox.json` with `jq` to an array of posts that have the `published` date and its `content`.
```
jq '{ data: [.orderedItems[] | {published: .published, content: (.object | objects | .content // empty) }] }' outbox.json > content.json
```
(remark: not a jq expert, thus this could probably be simplified)