blah.go

type MyTemplate struct {
        ContentVersion string               `json:"contentVersion"`
        // Resources could be other types outside of Resource1, hence the []string
        Resources      []string             `json:"resources"`
}

type Resource1 struct {
        ResourceType string `json:"-"`
        APIVersion   string `json:"apiVersion"`
        Comments     string `json:"comments"`
        Type         string `json:"type"`
}

var Resources = make(map[string]Resource1)

finalTemplate := MyTemplate{ContentVersion: "1.0.0.0"}

for k, v := range Resources {
        if len(k) > 1 {
                blah, err := json.Marshal(v)
                if err != nil {       
                }
                finalTemplate.Resources = append(finalTemplate.Resources, string(blah))
        }
}

finalBlah, err := json.Marshal(finalTemplate)
if err != nil {
}
fmt.Printf("%s\n", finalBlah)

// CURRENT OUTPUT
{
  "$schema":"",
  "contentVersion":"1.0.0.0",
  "resources":[
    "{ ///// Notice the quote?
        \"apiVersion\":\"\",
        \"comments\":\"\",
        \"type\":\"Microsoft.Network/virtualNetworks\"
    }" ///// Notice the quote?
  ]
}

// EXPECTED OUTPUT
// OUTPUT
{
  "$schema":"",
  "contentVersion":"1.0.0.0",
  "resources":[
    {
        \"apiVersion\":\"\",
        \"comments\":\"\",
        \"type\":\"Microsoft.Network/virtualNetworks\"
    }
  ]
}