diff --git a/simpleAPI/simpleapi.php b/simpleAPI/simpleapi.php
index da79a3c2ae..44002d3f01 100644
--- a/simpleAPI/simpleapi.php
+++ b/simpleAPI/simpleapi.php
@@ -276,7 +276,9 @@ private function getReadParameters($params)
             'get_pv_monthly_exported',
             'get_pv_yearly_exported',
             'get_pv_fault_str',
-            'get_pv_fault_state'
+            'get_pv_fault_state',
+            // System - Werte
+            'get_lastlivevaluesjson'
         ];
 
         foreach ($readableKeys as $key) {
@@ -485,9 +487,17 @@ private function formatRawOutput($data)
             $firstKey = array_keys($data)[0];
             $firstValue = $data[$firstKey];
 
+            // Für JSON-Strings: direkt den String-Wert zurückgeben
+            if (is_string($firstValue)) {
+                return $firstValue;
+            }
+
             if (is_array($firstValue) && count($firstValue) === 1) {
                 return array_values($firstValue)[0];
             }
+            
+            // Für andere Array-Strukturen: ersten Wert zurückgeben
+            return $firstValue;
         }
 
         return $data;
diff --git a/simpleAPI/src/ParameterHandler.php b/simpleAPI/src/ParameterHandler.php
index 3fd1306bfd..f26e015d19 100644
--- a/simpleAPI/src/ParameterHandler.php
+++ b/simpleAPI/src/ParameterHandler.php
@@ -200,6 +200,9 @@ public function readParameter($param, $id)
             case 'get_pv_fault_state':
                 return $this->getPvFaultState($id);
 
+            case 'get_lastlivevaluesjson':
+                return $this->getLastLiveValuesJson();
+
             default:
                 return null;
         }
@@ -1531,4 +1534,24 @@ private function setBatMode($value)
             return ['success' => false, 'message' => 'Error setting bat mode: ' . $e->getMessage()];
         }
     }
+
+    /**
+     * Lese openWB/system/lastlivevaluesJson Topic 1:1 aus
+     */
+    private function getLastLiveValuesJson()
+    {
+        $topic = "openWB/graph/lastlivevaluesJson";
+        $jsonValue = $this->mqttClient->getValue($topic);
+        
+        if ($jsonValue === null) {
+            return [
+                'get_lastlivevaluesjson' => null
+            ];
+        }
+        
+        // JSON-String 1:1 zurückgeben
+        return [
+            'get_lastlivevaluesjson' => $jsonValue
+        ];
+    }
 }