Fix metric args plot values

src/evidently/ui/dashboards.py

@@ -21,6 +21,7 @@
 from evidently.model.dashboard import DashboardInfo
 from evidently.model.widget import BaseWidgetInfo
 from evidently.pydantic_utils import EnumValueMixin
+from evidently.pydantic_utils import EvidentlyBaseModel
 from evidently.pydantic_utils import FieldPath
 from evidently.pydantic_utils import PolymorphicModel
 from evidently.renderers.html_widgets import CounterData
@@ -87,7 +88,7 @@ class PanelValue(BaseModel):
     field_path: Union[str, FieldPath]
     metric_id: Optional[str] = None
     metric_hash: Optional[int] = None
-    metric_args: Dict[str, Any] = {}
+    metric_args: Dict[str, Union[EvidentlyBaseModel, Any]] = {}
     legend: Optional[str] = None
 
     @property

tests/ui/test_dashboards.py

@@ -1,8 +1,12 @@
+import json
 from typing import Dict
 
 import pytest
+from pydantic import parse_obj_as
 
 from evidently.base_metric import MetricResult
+from evidently.descriptors import OOV
+from evidently.ui.dashboards import PanelValue
 from evidently.ui.dashboards import getattr_nested
 
 
@@ -21,3 +25,12 @@ class B(MetricResult):
 )
 def test_getattr_nested(obj, path: str, value):
     assert getattr_nested(obj, path.split(".")) == value
+
+
+def test_panel_value_metric_args_ser():
+    pv = PanelValue(field_path="", metric_args={"col": OOV(display_name="OOV").for_column("Review_Text")})
+
+    pl = json.dumps(pv.dict())
+    pv2 = parse_obj_as(PanelValue, json.loads(pl))
+
+    assert pv2 == pv