Mapped Group of IP Hosts

Hey everyone,

If I want to create a DNAT entry to map External IP: 1.1.1.1 to a group of 20 Mapped IP addresses (not in a range or subnet, for eg, 1.1.1.10, 1.1.1.20, 1.1.1.30, etc), how can I achieve this on the Fortigate? I don't see an option to add multiple mapped hosts or group in a single rule. Is this possible in any way, as other FWs do have this capability. Thanks!