Change php-fpm setting from ondemand to dynamic

I would like to change some php-fpm master process config cpanel version: v78.0.23 I created new file system.yaml in /var/cpanel/ApachePHPFPM and placed following entries --- pm: dynamic pm_start_servers = 4 pm_min_spare_servers = 4 pm_max_spare_servers = 8
and recompiled using /scripts/php_fpm_config --rebuild but its failed, can any one pls explain valid method to change master values in fpm