API trigger get - filter multiple host groups

[registration_is_lame]

How to filter multiple host groups when using trigger.get?

I tried "group": "Test Servers", "group": "test2 servers", but that only returns "test2 servers" triggers.

curl -i -X POST -H 'Content-Type: application/json' -d '
{
"jsonrpc": "2.0",
"method": "trigger.get",
"params": {
"filter": {"value": "1"},
"group": "Test Servers",
"group": "test2 servers",
"sortfield": "lastchange",
"limit": 2000
},
"auth": "b4ccd2d132aa0205b72f8",
"id": 1
}' http://127.0.0.1/zabbix/api_jsonrpc.php