How to use environment variables from secrets without defining each variable

General Discussions
1

To use env variables from secrets I know we can use env: valueFrom: secretKeyRef and then secret name and each key. This is by each key. Is there a way to get this for all keys in the secret.

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: webapp-pod
spec:
  containers:
  - name: mycontainer
    image: kodekloud/simple-webapp-mysql
    env:
      - name: DB_Host
        valueFrom:
          secretKeyRef:
            name: db-secret
            key: DB_Host
      - name: DB_User
        valueFrom:
          secretKeyRef:
            name: db-secret
            key: DB_User
      - name: DB_Password
        valueFrom:
          secretKeyRef:
            name: db-secret
            key: DB_Password
  restartPolicy: Never
EOF