How to modify a nested object with jq

You can also do simply

.nested += {freshly: "added"}

Then you can add multiple nested keys at once

Well I found out myself how to do it. If you have a better solution, you're more than welcome to give it here.

jq '.nested=(.nested + {"freshly": "added"})'

Just assign the new value to the nested object.

.nested.freshly = "added"