How to scrape only a single port of a pod using kubernetes_sd_config

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Below is the config

- job_name: optisam
  scrape_interval: 10s
  scrape_timeout: 10s
  metrics_path: /metrics
  scheme: http
  kubernetes_sd_configs:
  - api_server: null
    role: pod
    namespaces:
      names:
      - int-optisam
  relabel_configs:
  - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
    separator: ;
    regex: "true"
    replacement: $1
    action: keep