我如何表示此結構的匹配標簽部分以打印出來。我嘗試以類似元數據的格式添加“NetworkPolicySpecPodSelector”結構，但我的格式不正確。package mainimport (    "fmt"    "io/ioutil"    "gopkg.in/yaml.v2")type Metadata struct {    Name      string `yaml:"name"`    Namespace string `yaml:"namespace"`}type Spec struct {    PodSelector NetworkPolicySpecPodSelector `yaml:"Spec"`}type NetworkPolicySpecPodSelector struct {    MatchLabels map[string][]string `yaml:"matchLabels"`}type Ingress struct {}type NetworkPolicy struct {    ApiVersion string   `yaml:"apiVersion`    Kind       string   `yaml:"kind"`    Metadata   Metadata `yaml:"metadata"`    Spec       struct {        PodSelector NetworkPolicySpecPodSelector    }    PolicyTypes []string `yaml:"policyTypes"`}func main() {    np := NetworkPolicy{        ApiVersion: "networking.k8s.io/v1",        Kind:       "NetworkPolicy",        Metadata: Metadata{            Name:      "allow-ingress",            Namespace: "default",        },        PolicyTypes: []string{"Ingress"},    }    yamlData, err := yaml.Marshal(&np)    if err != nil {        fmt.Printf("Error while Marshaling. %v", err)    }    fileName := "test.yaml"    err = ioutil.WriteFile(fileName, yamlData, 0644)    if err != nil {        panic("Unable to write data into the file")    }}我的輸出在這里：apiversion: networking.k8s.io/v1kind: NetworkPolicymetadata:  name: allow-ingress  namespace: defaultspec:  podselector:    matchLabels: {}policyTypes:- Ingress期望的輸出：apiversion: networking.k8s.io/v1kind: NetworkPolicymetadata:  name: allow-ingress  namespace: defaultspec:  podselector:    matchLabels:       env:prodpolicyTypes:- Ingress仍然需要成長，但我在這方面苦苦掙扎。該項目的目標是使用 YAML 輸出 Kubernetes 網絡策略。