encode json, falla acentos

app.py

@@ -13,9 +13,14 @@ class out_json():
     def __init__(self, w,l):
         self.word = w
         self.label = l
-class MyEncoder(JSONEncoder):
-        def default(self, o):
-            return o.__dict__
+class MyEncoder(json.JSONEncoder):
+    def default(self, obj):
+
+            return {
+                'word': obj.word,
+                'label': obj.label
+            }
+
 class Model:
    def __init__(self):
         self.texto=""
@@ -127,7 +132,7 @@ class Model:
               a = out_json(t.replace('##','').replace('Ġ','').replace('Ċ',''),pre_tokens[i].replace('▁',''))
               list.append(a)
            i=i+1
-       return MyEncoder().encode(list)
+       return json.dumps(list, cls=MyEncoder, ensure_ascii=False)#MyEncoder().encode(list)
    def tokens_identificados(self,tokens,pre_tokens):
        list=[]
        i=0