Currently we have macro {FUNCTION.VALUE} that returns calculated trigger function value. Currently the macro don't convert result to item units. As example, calculation for

avg(//net.if.out,3m)

 will be returned as raw bits (example 285774576.7989876 instead of 272.53 Mbps). In case client wants to use for visual control as example in Event name that is not convenient. It would be more informative and convenient if the macro would follow zabbix unit convention and use for that item defined units.