https://ubuntu.com/core/docs/networkmanager/configure-wifi-access-points
nmcli d wifi hotspot ifname <interface> ssid <ssid> password <password>
Example:
nmcli d wifi hotspot ifname wlan0 ssid zedbox_ap password <password>
Get it to work after reboot OR connect to a network autmatically after boot:
https://askubuntu.com/a/935727
nmcli con show
nmcli con mod <connection-name> connection.autoconnect yes
Typically
nmcli con mod Hotspot connection.autoconnect yes