Apple vCards provide no CATEGORIES

[blacksenator]

I've grouped my iCloud contacts into groups and would have expected them as CATEGORIES. A search has shown that Apple keeps the groups in

• separate vCards (X-ADDRESSBOOKSERVER-KIND:group) with
• keeping the group name: in 'N:' and
• lists therein the assigned contacts (X-ADDRESSBOOKSERVER-MEMBER:).

See example:

BEGIN:VCARD
VERSION:3.0
X-ADDRESSBOOKSERVER-KIND:group
PRODID:-//Apple Inc.//iOS 9.3.5//EN
N:PERS
FN:PERS
UID:6284484E-A4E4-42EF-8CFB-301C0DE2B2D7
X-ADDRESSBOOKSERVER-MEMBER:urn:uuid:8C5292AA-F2D8-41DB-A5B6-582C39AD9BF3
X-ADDRESSBOOKSERVER-MEMBER:urn:uuid:35185E23-D65D-46CA-9638-8DB5117740B9

...

X-ADDRESSBOOKSERVER-MEMBER:urn:uuid:EDA333D2-2300-43A5-AFE9-045A8A5D6FF1
X-ADDRESSBOOKSERVER-MEMBER:urn:uuid:2A009E2D-5A49-4550-B64A-E4CE40611DEB
X-ADDRESSBOOKSERVER-MEMBER:urn:uuid:44287153-AE5A-4131-BBFF-D20E8F3A0ECD
END:VCARD

It would be extremely helpful if these groups were assigned as CATEGORIES to the respective contacts.