Webmin - create admin user from terminal/command line on ubuntu 18.04

How to create webmin admin user from terminal on ubuntu 18.04

Step :

myadmin:myadminpassword
myadmin: acl adsl-client ajaxterm apache at backup-config bacula-backup bandwidth bind8 change-user cluster-copy cluster-cron cluster-passwd cluster-shell cluster-software cluster-useradmin cluster-usermin cluster-webmin cpan cron custom dfsadmin dhcpd dovecot exim exports fail2ban fdisk fetchmail filemin filter firewall firewall6 firewalld fsdump grub heartbeat htaccess-htpasswd idmapd inetd init inittab ipfilter ipfw ipsec iscsi-client iscsi-server iscsi-target iscsi-tgtd jabber krb5 ldap-client ldap-server ldap-useradmin logrotate lpadmin lvm mailboxes mailcap man mon mount mysql net nis openslp package-updates pam pap passwd phpini postfix postgresql ppp-client pptp-client pptp-server proc procmail proftpd qmailadmin quota raid samba sarg sendmail servers shell shorewall shorewall6 smart-status smf software spam squid sshd status stunnel syslog-ng syslog system-status tcpwrappers telnet time tunnel updown useradmin usermin vgetty webalizer webmin webmincron webminlog wuftpd xinetd