`disabledAPIVersions` is a list which Helm would print as `[item1 item2]` into
YAML, thus, corrupting the YAML format. This can be mitigated by applying the
Helm template function `toJson` (or `toYaml`) to the list in question which
would format the list as `["item1", "item2"]`. This is no issue for scalars,
since Helm's format coincidently matches the one required by YAML.