а чем ну устраивает стандартный путь?
gzip on;
gzip_min_length 1024;
gzip_comp_level 1;
gzip_proxied any;
gzip_types text/plain text/xml text/css application/x-javascript
text/javascript application/json;
gzip_buffers 4 64k;
Posted at Nginx Forum: https://forum.nginx.org/read.php?21,274006,274023#msg-274023