jq '"replicas: " + (.spec.replicas | tostring) + " kind: " + .kind'

cat data/s1.json cat data/s1.json | jq '"replicas: " + (.spec.replicas | tostring) + " kind: " + .kind'
{
    "kind": "Deployment",
    "spec": {
        "replicas": 1
    }
}
    
"replicas: 1 kind: Deployment"