How to Access User Total Download, Upload, Data from REST API in /user-manager/user/?

Sorry but these are not working.

{
    "once": true,
    ".query": [".id=*8"]
}

or

{
    "once": true,
    ".query": ".id=*8"
}

or

{
    "once": true,
    ".query": ".id=*8"
}

All are the same result “bad request” “detail”: “missing =.id=”.

BUT!!
This works!

{
    "once": true,
    ".id": "*8"
}

Result:

[
{
“active-sessions”: “1”,
“active-sub-sessions”: “1”,
“actual-profile”: “xxxxx-xxxxxx”,
“attributes-details”: “Private info Name:xxxxx:string:0xxxxxx”,
“total-download”: “874034635”,
“total-upload”: “48807958”,
“total-uptime”: “1d5h13m23s”
}
]

The value of “.id” that is “*8” from id of user in user manager.

Thank you for suggest for “once” that is required to make it work.