How do you apply a recursive formatting with Go Templates (Helm)?

I'm using helm and given a yaml object I want to flatten it while applying some recursive formatting.

Given this:

some_map:
  with: different
  indentation:
    levels: and
  nested:
    sub: 
      maps: "42"
    and_more:
      maps: 42

I want to (for example) get this:

some_map.with="different"
some_map.indentation.levels="and"
some_map.nested.sub.maps="42"
some_map.nested.and_more.maps=42

I haven't read anything about recursive looping in the helm docs, keep in mind that the format of the recursion in the example ( "%v.%v" if !root else "%v=%v" ) may vary.

another approach

_helpers.tpl:

{{- define "template.flattenFn" -}}
  {{- $ctx := . -}}
  {{- if or (eq (kindOf .data) "map") (eq (kindOf .data) "slice") }}
    {{- range $key, $value := .data }}
      {{- include "template.flattenFn" (dict "prefixes" (append $ctx.prefixes $key) "data" $value ) }}
    {{- end }}
  {{- else if .prefixes }}
    {{- printf "\"%s\":%s,"  (join "__" .prefixes) ( mustToJson ( .data | toString )) }}
  {{- end }}
{{- end -}}

{{- define "template.flatten" -}}
{{- $result := include "template.flattenFn" (dict "prefixes" list "data" . ) -}}
{ {{- trimSuffix "," $result -}} }
{{- end -}}

values.yaml

  environment_map:
    Log:
      Level:
        Default: Debug
      Target:
      - Name: Console
        Args:
          formatter: "JsonFormatter"

usage

{{- range $env, $value := include "template.flatten" .Values.environment_map | fromYaml }}
  - name: {{ $env }}
    value: {{ $value | quote }}
{{- end }}

result

    - name: Log__Level__Default
      value: "Debug"
    - name: Log__Target__0__Args__formatter
      value: "JsonFormatter"
    - name: Log__Target__0__Name
      value: "Console"