diff --git a/argdantic/stores/base.py b/argdantic/stores/base.py
index 94fa09c..8141485 100644
--- a/argdantic/stores/base.py
+++ b/argdantic/stores/base.py
@@ -1,6 +1,6 @@
 from abc import ABC, abstractmethod
 from pathlib import Path
-from typing import Callable, Optional, Set, Union
+from typing import Callable, Literal, Optional, Set, Union
 
 from pydantic import BaseModel
 from pydantic_settings import BaseSettings
@@ -18,6 +18,7 @@ def __init__(
         self,
         path: Union[str, Path],
         *,
+        mode: Literal["python", "json"] = "python",
         encoding: str = "utf-8",
         include: Optional[Set[str]] = None,
         exclude: Optional[Set[str]] = None,
@@ -27,6 +28,7 @@ def __init__(
         exclude_none: bool = False,
     ) -> None:
         self.path = Path(path)
+        self.mode = mode
         self.encoding = encoding
         self.include = include
         self.exclude = exclude
diff --git a/argdantic/stores/json.py b/argdantic/stores/json.py
index 2bfc1a6..c23b156 100644
--- a/argdantic/stores/json.py
+++ b/argdantic/stores/json.py
@@ -1,3 +1,6 @@
+from pathlib import Path
+from typing import Optional, Set, Union
+
 from pydantic_settings import BaseSettings
 
 from argdantic.stores.base import BaseSettingsStore
@@ -9,6 +12,30 @@ class JsonSettingsStore(BaseSettingsStore):
     Orjson is used if available, otherwise the standard json module is used.
     """
 
+    def __init__(
+        self,
+        path: Union[str, Path],
+        *,
+        encoding: str = "utf-8",
+        include: Optional[Set[str]] = None,
+        exclude: Optional[Set[str]] = None,
+        by_alias: bool = False,
+        exclude_unset: bool = False,
+        exclude_defaults: bool = False,
+        exclude_none: bool = False,
+    ) -> None:
+        super().__init__(
+            path,
+            mode="json",
+            encoding=encoding,
+            include=include,
+            exclude=exclude,
+            by_alias=by_alias,
+            exclude_unset=exclude_unset,
+            exclude_defaults=exclude_defaults,
+            exclude_none=exclude_none,
+        )
+
     def __call__(self, settings: BaseSettings) -> None:
         with self.path.open("wb") as f:
             text = settings.model_dump_json(
diff --git a/argdantic/stores/toml.py b/argdantic/stores/toml.py
index 4e023fc..57bf69a 100644
--- a/argdantic/stores/toml.py
+++ b/argdantic/stores/toml.py
@@ -21,6 +21,7 @@ def __call__(self, settings: BaseSettings) -> None:
         with self.path.open("wb") as f:
             text = toml.dumps(
                 settings.model_dump(
+                    mode=self.mode,
                     include=self.include,
                     exclude=self.exclude,
                     by_alias=self.by_alias,
diff --git a/argdantic/stores/yaml.py b/argdantic/stores/yaml.py
index 7fd891a..71b616e 100644
--- a/argdantic/stores/yaml.py
+++ b/argdantic/stores/yaml.py
@@ -21,6 +21,7 @@ def __call__(self, settings: BaseSettings) -> None:
 
         with self.path.open("w") as f:
             data = settings.model_dump(
+                mode=self.mode,
                 include=self.include,
                 exclude=self.exclude,
                 by_alias=self.by_alias,
diff --git a/tests/test_stores/test_json.py b/tests/test_stores/test_json.py
index 5ae1ca8..13dcd69 100644
--- a/tests/test_stores/test_json.py
+++ b/tests/test_stores/test_json.py
@@ -79,3 +79,20 @@ def main(foo: str = "baz", bar: int = 42) -> None:
     result = runner.invoke(cli, [])
     assert result.exception is None
     assert result.return_value == ("baz", 42)
+
+
+def test_parser_using_json_store_complex_data(tmp_path: Path, runner: CLIRunner) -> None:
+    from pathlib import Path
+
+    from argdantic import ArgParser
+
+    cli = ArgParser()
+    path = tmp_path / "settings.json"
+
+    @cli.command(stores=[JsonSettingsStore(path)])
+    def main(foo: Path = "baz", bar: int = 42) -> None:
+        return foo, bar
+
+    result = runner.invoke(cli, [])
+    assert result.exception is None
+    assert result.return_value == ("baz", 42)
diff --git a/tests/test_stores/test_toml.py b/tests/test_stores/test_toml.py
index 8925901..22ed593 100644
--- a/tests/test_stores/test_toml.py
+++ b/tests/test_stores/test_toml.py
@@ -61,3 +61,19 @@ def main(foo: str = "baz", bar: int = 42) -> None:
     result = runner.invoke(parser, [])
     assert result.exception is None
     assert result.return_value == ("baz", 42)
+
+
+def test_parser_using_toml_store_complex_data(tmp_path: Path, runner: CLIRunner) -> None:
+    from argdantic import ArgParser
+    from argdantic.stores.toml import TomlSettingsStore
+
+    path = tmp_path / "settings.toml"
+    parser = ArgParser()
+
+    @parser.command(stores=[TomlSettingsStore(path, mode="json")])
+    def main(foo: Path = "baz", bar: int = 42) -> None:
+        return foo, bar
+
+    result = runner.invoke(parser, [])
+    assert result.exception is None
+    assert result.return_value == ("baz", 42)
diff --git a/tests/test_stores/test_yaml.py b/tests/test_stores/test_yaml.py
index 01a7975..84d313f 100644
--- a/tests/test_stores/test_yaml.py
+++ b/tests/test_stores/test_yaml.py
@@ -68,3 +68,24 @@ def main(foo: str = "baz", bar: int = 42) -> None:
     assert result.exception is None
     assert result.return_value == ("qux", 42)
     assert result.return_value == ("qux", 42)
+
+
+def test_parser_using_yaml_store_complex_data(tmp_path: Path, runner: CLIRunner) -> None:
+    from argdantic import ArgParser
+    from argdantic.stores.yaml import YamlSettingsStore
+
+    path = tmp_path / "settings.yaml"
+    parser = ArgParser()
+
+    @parser.command(stores=[YamlSettingsStore(path, mode="json")])
+    def main(foo: Path = "baz", bar: int = 42) -> None:
+        return str(foo), bar
+
+    result = runner.invoke(parser, [])
+    assert result.exception is None
+    assert result.return_value == ("baz", 42)
+
+    result = runner.invoke(parser, ["--foo", "qux", "--bar", "24"])
+    assert result.exception is None
+    print(result.return_value)
+    assert result.return_value == ("qux", 24)