NAT Question

Hello all I am currently testing Sophos UTM V9
I had a question on how to properly do NAT.
My network goes as follows.

------WAN-----(SOPHOSFW)---LAN---SWITCH----SERVER

I have a block of 5 IP's from my ISP I am using 1 for the FW.
One of the free IP's I want to use for my Server Which for my
Lan side I am using 192.168.1.0/24 My Server is 192.168.1.99.

From the outside I want to be able to hit the internal server using
its public IP I also want it to be open on port 443.

How would I go about doing that ?

Thank You All