gomplate: executing "<arg>" at <.Values.tpl.organization>: map has no entry for key "Values"

Here is my yaml file

apiVersion: myapi.com/v1
kind: Template
metadata:
  name: {{ .Values.tpl.organization }}-template-mkytemplatetemplate
spec:
  # Add fields here
  organization: {{ .Values.tpl.organization }}
  purpose: {{ .Values.tpl.purpose }}
  version: {{ .Chart.appVersion }}
  location: {{.Values.location}}/template.tgz
  name: mkytemplatetemplate
  namePattern: ^[a-z0-9\-]{3,25}$
  description: "# Please do not use the template\ntest modify run.sh"
  author: string

I use gomplate to replace all {{xxx}} to corresponding values in Chart.yaml or Values.yaml. Here is my code

func main() {
	log.Println("hello")
	//BasicTemplate()
	Gomplate()
}

func Gomplate() {
	workspace := "/Users/i517131/code/mkytemplatetemplate/.ci/chart"
	inBs, _ := ioutil.ReadFile(path.Join(workspace, "templates/template.yaml"))
	in := string(inBs)
	cfg := &gomplate.Config{
		Input: in,
		OutputFiles: []string{path.Join(workspace, "result.yaml")},
		DataSources: []string{
			fmt.Sprintf("%s=%s", "Chart", path.Join(workspace, "Chart.yaml")),
			fmt.Sprintf("%s=%s", "Values", path.Join(workspace, "values.yaml")),
		},
	}
	err := gomplate.RunTemplates(cfg)
	if err != nil {
		panic(err)
	}
}

but I receive an error like this panic: template: <arg>:4:18: executing "<arg>" at <.Values.tpl.organization>: map has no entry for key "Values". at err := gomplate.RunTemplates(cfg)

At first, when I run cmd gomplate -f .ci/chart/templates/template.yaml -d Chart=.ci/chart/Chart.yaml -d Values=.ci/chart/values.yaml -o result.yaml, I receive the save error.
I searched the internet and in github, the author suggest us use -c instead of -d

But the gomplate in go can only use gomplate.Config to run templates and do not support -c. What can I do?

result generated by -c cmd

apiVersion: myapi.com/v1
kind: Template
metadata:
  name: mky-template-mkytemplatetemplate
spec:
  # Add fields here
  organization: mky
  purpose: prod
  version: 1.0.0
  location: _/template.tgz
  name: mkytemplatetemplate
  namePattern: ^[a-z0-9\-]{3,25}$
  description: "# Please do not use the template\ntest modify run.sh"
  author: string

use Contexts not DataSource

cfg := &gomplate.Config{
		Input: in,
		OutputFiles: []string{path.Join(workspace, "result.yaml")},
		Contexts: []string{
			fmt.Sprintf("%s=%s", "Chart", path.Join(workspace, "Chart.yaml")),
			fmt.Sprintf("%s=%s", "Values", path.Join(workspace, "values.yaml")),
		},
	}