Jitsi Docker - cannot modify meet.conf (changes are lost on every restart)

Hi! Please help me to find the right way to change settings in .jitsi-meet-cfg/web/nginx/meet.conf
I want to see real user IPs in prosody, so I have to change proxy_set_header option and there is no way to set it via ENV.

Every time I restart web container - all the changes in this file are lost. So what is the right way to change meet.conf for web container?