Get all on dashboard displayed triggers with Java / Zabbix API

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I need to get all active triggers which are on my dashboard. Here a small screenshot of the dashboard with only one trigger in it:


This is my Code which I already wrote:

int count = 2;
    while (count <= 5){
    	jsonObj.put("jsonrpc", "2.0");
    	jsonObj.put("method", "trigger.get");
    	// Value: 0 = OK | 1 = PROBLEM | 2 = UNKNOWN
    	// Priority: 0 = Not classified | 1 = Information | 2 = Warning | 3 =
    	// Average | 4 = High | 5 = Disaster
    
    	// count = priority. It start with two and end with 5
    	jsonObj.put("params", (new JSONObject().put("filter", new JSONObject().put("priority", count).put("group", "WZU-Server").put("value", 1)).put("output", "extend")));
    	jsonObj.put("id", 0);
    	jsonObj.put("auth", "8ba6b9f29dd68e0c98cdea9ee01f2614");
    	
    	putMethod.setRequestEntity(new StringRequestEntity(jsonObj.toString(), "application/json", "UTF-8"));
    }

At this time, my dashboard is empty. So I shouldn't get any Objects of this code.
"Warning" is empty, so it is okay.
"Average returns 8 Objects. All of the objects are older than a week. Bad!
"High" is empty, so it is okay.
"Disaster" returns 1 Objects. This object is over one week old. Bad!

So how can I achieve that I only get the entrys of my dashboard?