No, you need to shell into your server and do this at the command line.  Go to the directory of the php you need to change; you will probably find a php-fpm directory or php-fpm.d directory.  Once you find the correct location, you simply edit the pool file; like www.conf, or it may be a random string of numbers.  Just open it with vi editor or nano, make the edits, save the file, then restart the php-fpm service.