Public IP Assignment

My ISP delivers more than 1 ip to me via DHCP.
How do I get another device on my network to request a public ip?

Schematic example attached
example.png

According to the wiki, on uses netmapping. However I have no experience with mutiple WANIPs from a single provider.
1:1 mapping

If you want to link Public IP subnet 11.11.11.0/24 to local one 2.2.2.0/24, you should use destination address translation and source address translation features with action=netmap.

/ip firewall nat add chain=dstnat dst-address=11.11.11.0/24
action=netmap to-addresses=2.2.2.0/24

/ip firewall nat add chain=srcnat src-address=2.2.2.0/24
action=netmap to-addresses=11.11.11.0/24