Question: How to send the username to the Upstream?

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Hi team,
how can SafeLine WAF send the username of an authenticated user to the upstream server?

My setup is to use SafeLine as WAF with authentication as reverse proxy to protect a webmail service.

Login Method: Account password, Simple Auth

I expect the username to appear in the HTTP headers, but nothing found.

I tried to add

proxy_set_header X-Forwarded-User $remote_user;

as Custom NGINX Config, but the username is still missing.

Which configuration setting is required to let the upstream server know the user's name?
Please advice. Thanks for your help!

8.7.0 supports obtaining through callback, see https://docs.waf.chaitin.com/en/tutorials/advanced/Auth