GMail - Expose GMail labels ?

[mikolfaro]

Response supports X-GM-Labels, that is the labeling system used by GMail.
Is it possible to expose the value in Fetch?

/// Extract the `X-GM-LABELS` of a `FETCH` response
///
/// See [Access to Gmail labels: X-GM-LABELS](https://developers.google.com/gmail/imap/imap-extensions#access_to_labels_x-gm-labels)
/// for details.
pub fn gmail_labels(&self) -> Option<&Vec<Cow<'_, str>>> {
    if let Response::Fetch(_, attrs) = self.response.parsed() {
         attrs
            .iter()
             .filter_map(|av| match av {
                AttributeValue::GmailLabels(gl) => Some(gl),
                _ => None,
            })
            .next()
    } else {
         unreachable!()
    }
}