Issue: Use macros to populate Inventory of hosts

I'm trying a way to automate network maps creation. And because of icon mapping uses inventory info, i wanted to put there useful info, in a easy way of course, remembering a huge amount of hosts that we have.

So, i wanted to populate "nickname" inventory field with a simple macro {HOST.NAME} and mass update option. But the inventory can't processes that Macro and nickname still "{HOST.NAME}" and can't change icons accordly the name of the host.

Sorry for any english error, and if someone don't understand fell free to ask.

I really don't want to populate all hosts with his hostname on the inventory tab.