Using Lookup Function

{{- $cm := lookup "v1" "ConfigMap" .Release.Namespace "shared-config" }}
{{- if $cm }}
sharedKey: {{ index $cm.data "key" | quote }}
{{- end }}

{{- $existing := lookup "v1" "Secret" .Release.Namespace (printf "%s-creds" (include "myapp.fullname" .)) }}
{{- $password := "" }}
{{- if $existing }}
{{- $password = index $existing.data "password" | b64dec }}
{{- else }}
{{- $password = randAlphaNum 24 }}
{{- end }}
apiVersion: v1
kind: Secret
metadata:
  name: {{ include "myapp.fullname" . }}-creds
type: Opaque
data:
  password: {{ $password | b64enc | quote }}

{{- $svc := lookup "v1" "Service" .Release.Namespace "myservice" }}
clusterIP: {{ $svc.spec.clusterIP | default "auto" }}
port: {{ (index $svc.spec.ports 0).port }}

{{- if not (lookup "v1" "Namespace" "" "monitoring") }}
apiVersion: v1
kind: Namespace
metadata:
  name: monitoring
{{- end }}

{{- range (lookup "v1" "Service" "" "").items }}
- {{ .metadata.namespace }}/{{ .metadata.name }}
{{- end }}