def is_valid_helm_chart(content):
    """
    Check if input dictionary contains mandatory keys of a Helm Chart.yaml file,
    as documented here https://helm.sh/docs/topics/charts/#the-chartyaml-file
    :param content: parsed YAML file as dictionary of key values
    :return: True if dict contains mandatory values, else False
    """
    return all(x in content for x in ['apiVersion', 'name', 'version'])