logrotate.conf:
include /usr/local/etc/logrotate.d
Only one hour later I understood that I can just write a path with multiple meta-characters to include ALL logs in just one line:
/usr/local/www/*/logs/*.log {
daily
rotate 60
compress
notifempty
postrotate
[ ! -f /var/run/nginx.pid ] || kill -USR1 `cat /var/run/nginx.pid`
endscript
}