Creating yaml list using the go template

Question

I am looking to create a yaml file in the following format. Using Go template

  Custom_listeners:
    Config1 : config_value
    Config2 : config_value    

    copy_files:
      - source_path: /path/to/file.txt
        destination_path: /tmp/file.txt

I am using the follow template code to get the value

Template : 
custom_listeners:  {{ range $cl := $.Vars.CustomListeners }}
    {{ range $k,$v := $cl.Values }}{{ $k }}: "{{ $v }}"
    {{ end }}{{ end }}

Custom listener map : 

type CustomListener map[string]interface{}

What changes can I made to above template to create the yaml in the follow format. with - on the source_path:

 Custom_listeners: 
   copy_files:
     - source_path1: /path/to/file.txt
       destination_path: /tmp/file.txt

     - source_path2: /path/to/file.txt
       destination_path: /tmp/file.txt