Like: wo site create mysite.com --wp --umyuserr:gmygroup
The script create and assign the user and group for the folder, fix the permissions and create the php pool.
RunCloud does exactly like that.
I'm doing this manually everytime
Ex PHP POOL:
[mysite]
listen = 127.0.0.1:9087
listen.owner = www-data
listen.group = www-data
listen.backlog = 65536
pm.status_path = /status
ping.path = /ping
ping.response = pong
user = mysite
group = mysite
pm = ondemand
php_admin_value[open_basedir] = /var/www/mysite:/var/lib/php/session:/tmp