How to use the API to find a data element?

Question

Zabbix

I don't understand how to make a jsonrpc request, and is it possible, in principle, to find the data element with the key_:"hw.addr" key and the lastvalue:"value" value.
I tried to select all hosts and add the items field to them.
'{
"jsonrpc": "2.0",
"id": 2,
"method": "host.get",
"params": {
"selectItems":{
"search":{ "key_":"hw.addr" }
}
},
"auth": "'.
But the items field comes with empty arrays for some reason...