refer values in other values in values.yml code example

Example: how to pass multiple ports in values.yaml of helm

apiVersion: v1
kind: Service
metadata:
  name: {{ .Values.project }}-svc
spec:
  type: ClusterIP
  ports:
  - name: {{ .Values.project }}-web
    port: {{ .Values.serviceweb.port }}
    protocol: TCP
    targetPort: {{ .Values.serviceweb.targetPort }}
  - name: {{ .Values.project }}-tcp
    port: {{ .Values.servicetcp.port }}
    protocol: TCP
    targetPort: {{ .Values.servicetcp.targetPort }}
  selector:
    app: {{ .Values.project }}-{{ .Values.environment }}