Varnish Variable for Decoded req.http.Authorization

[Kelvin Loke]

Good day everyday, I have a question about req.http.Authorization.
As req.http.Authorization is at the format of "Basic Uk1CVTUweWMjIyMg==",
do we have any variable for the base64 decoded value from
req.http.Authorization?

I knew that Varnishncsa has %u for this purpose, it would be great if there
is a default variable that I can use in Varnish VCL.

Thanks!
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