Regarding `cf-priority` response header outside workers (as per "Better HTTP/2 Prioritization for a Faster Web" article)

http2
#1

I’ve just read the “Better HTTP/2 Prioritization for a Faster Web” article:

And the HTTP/2 response header cf-priority is mentioned as available from workers. My question is if this header is also available for “normal” proxy-ed traffic as set by a “normal” HTTP server.

(As for example the Link header is used to implement server-side push.)