> What is the way to inject http headers in httpd for static content?

httpd(8) is not for injecting/manipulating HTTP-headers.

Example:
If you need to add an "foobar" header you have to combine httpd(8)
and relayd(8) 
then select [1] either the request or the response (depends on your
use-case and in which connection you want to see the foobar header) [2] 
then set [3] the "foobar" header [4]

[1] man -O tag=match relayd.conf
[2] man -O tag=request relayd.conf
[3] man -O tag=set relayd.conf
[4] man -O tag=header relayd.conf

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