stuck parsing a json object, to extract "key/value" pairs

I have an application that generates data in this form:

[  {"metadata": {"labels": {"team": "eng"      }    },"spec": {"labels": {"instance_id": {"result": "x387j"        },"another_field": {"result": "dfsf"        }      }    }  },  {"metadata": {"labels": {"team": "sre"      }    },"spec": {"labels": {"instance_id": {"result": "sd9f"        }      }    }  }]

Labels, here are the keys in .metadata.labels and .spec.labels.I can extract the labels as:

% jq -C ' .[] | ( .metadata.labels , .spec.labels ) | keys | .[] ' tmp/x.json | sort | uniq"instance_id""team"

I want to extract the label and result pairs as:

"team": "eng""instance_id": "x387j""another_field": "dfsf""team": "sre""instance_id": "sd9f"

I can get the objects in .metadata.labels, albiet in different form:

% jq -C '.[] | (.metadata.labels) ' tmp/x.json{"team": "eng"}{"team": "sre"}

generates one part, but here, I am not able to remove just the braces.The suggestion here, to remove brackets, quotes, and commasremoves the braces, but also the keys.

% jq -C '.[] | (.metadata.labels) | .[] ' tmp/x.json"eng""sre"

Also, I am then not able to figure out to get the objects in .spec.labels.