最后，我能够执行以下操作:

In the end I was able to do something like this:

{{ $lines := splitList "\n" .Values.config -}}
{{- range $lines }}
{{- if not (. | trim | empty) -}}
{{- $kv := . | splitn ":" 2 -}}
{{ printf "MY_APP_%s: %s" $kv._0 ($kv._1 | trim | quote) | indent 2 }}
{{ end -}}
{{- end -}}

我很难弄清{{- vs {{，而helm install --debug --dry-run .在这部分中有很大帮助.

I had a hard time getting the {{- vs {{ right, and helm install --debug --dry-run . help a lot in this part.

有点乱，所以我很想看看是否有人有更好的解决方案.

It's kind of messy, so I would be very interested in seeing if anyone has a better solution.