Add masking strategy override to FidesMeta

CHANGELOG.md

@@ -16,6 +16,7 @@ The types of changes are:
 
 ## [Unreleased](https://github.com/ethyca/fideslang/compare/3.0.8...main)
 
+- Add field-level masking strategy overrides [#23](https://github.com/ethyca/fideslang/pull/23)
 
 ## [3.0.8](https://github.com/ethyca/fideslang/compare/3.0.7...3.0.8)
 

src/fideslang/models.py

@@ -7,7 +7,7 @@
 
 from datetime import datetime
 from enum import Enum
-from typing import Annotated, Dict, List, Optional, Union
+from typing import Annotated, Dict, List, Optional, Union, Any
 
 from packaging.version import InvalidVersion, Version
 from pydantic import (
@@ -69,11 +69,18 @@ class MaskingStrategies(str, Enum):
 
 
 class MaskingStrategyOverride(BaseModel):
-    """Overrides policy-level masking strategies."""
+    """Overrides collection-level masking strategies."""
 
     strategy: MaskingStrategies
 
 
+class FieldMaskingStrategyOverride(BaseModel):  # type: ignore[misc]
+    """Overrides field-level masking strategies."""
+
+    strategy: str
+    configuration: Optional[Dict[str, Any]] = {}  # type: ignore[misc]
+
+
 class FidesModel(BaseModel):
     """The base model for most top-level Fides objects."""
 
@@ -418,6 +425,10 @@ class FidesMeta(BaseModel):
         default=None,
         description="Optionally specify that a field may be used as a custom request field in DSRs. The value is the name of the field in the DSR.",
     )
+    masking_strategy_override: Optional[FieldMaskingStrategyOverride] = Field(
+        default=None,
+        description="Optionally specify a masking strategy override for this field.",
+    )
 
     @field_validator("data_type")
     @classmethod