code: def test_annotation_put_schema_json_metadata() -> None:
      result = AnnotationPutSchema().load(
          {"json_metadata": '{"abc": 123}'}
      )
      assert result["json_metadata"] == '{"abc": 123}'
  
imports: import pytest
  from marshmallow.exceptions import ValidationError
  from superset.annotation_layers.annotations.schemas import AnnotationPostSchema, AnnotationPutSchema
  from superset.annotation_layers.schemas import AnnotationLayerPostSchema, AnnotationLayerPutSchema
  from tests.unit_tests.annotation_layers.fixtures import END_DTTM, END_STR, START_DTTM, START_STR
label_desc: Use image node_id 17 for calling a global function with example usage: test_annotation_put_schema_json_metadata() without return types