Unable to dump blocks without having quotes on keys

I am trying to dump JSON data into YAML in a way that makes is very easy to read by humans (as this goes to some logs).

Some of the values contain multiline strigs (stderr/stdout) and there is a must to avoid wrapping them.

    data = json.loads("""{"key":"foo\\nbar"}""")
    output = yaml.safe_dump(data,
        allow_unicode=True,
        default_flow_style=False,
        canonical=False,
        default_style="|")
    print(output)

    output = yaml.safe_dump(data,
        allow_unicode=True,
        default_flow_style=False,
        canonical=False,
        default_style=None)
    print(output)

First formatting:

"key": |-
  foobar

Second option:

key: 'foo

  bar'

It seem that with default_style="|" I do get the desired wrapping of multiline values but I lose the simplicity of the unquoted lines.

How can I get something like below?

key: |
  foo
  bar

[ysaakpr]

looks like the if the value has ":" in it, then the whole value has to be in quotes in order to work with quotes

[Yop-La]

Use ruamel.yaml instead

it is better documented than pyyaml: https://pypi.org/project/ruamel.yaml/