Pre-fill the UI "silence Creator" field from an HTTP header received ? (alertmanager + oauth2-proxy)

[copolycube]

Hello,
In order to secure the access to alertmanager I used an identity provider with the oauth2-proxy, which transmits some HTTP headers to the resulting application, in this case, alertmanager.
I wanted to pre-fill (even better: force the value if present) the silence creator field from the UI to a certain HTTP header received, let's say X-Auth-Request-Email for example.

I didn't found any example doing this (either pre-fill or force, both would be acceptable), any idea on how to achieve this ?

thanks !