diff --git a/pdl-live/src/pdl_ast.d.ts b/pdl-live/src/pdl_ast.d.ts
index d34c57bf..157efd4c 100644
--- a/pdl-live/src/pdl_ast.d.ts
+++ b/pdl-live/src/pdl_ast.d.ts
@@ -1240,6 +1240,10 @@ export type Repeat =
       | ErrorBlock
       | EmptyBlock
     )[];
+/**
+ * Define how to combine the result of each iteration.
+ *
+ */
 export type IterationType = "sequence" | "array" | "document";
 export type Trace1 =
   | (
@@ -1425,6 +1429,11 @@ export type Repeat1 =
       | ErrorBlock
       | EmptyBlock
     )[];
+/**
+ * Define how to combine the result of each iteration.
+ *
+ */
+export type IterationType1 = "sequence" | "array" | "document";
 export type Trace2 =
   | (
       | number
@@ -1614,6 +1623,11 @@ export type Repeat2 =
  *
  */
 export type NumIterations = number;
+/**
+ * Define how to combine the result of each iteration.
+ *
+ */
+export type IterationType2 = "sequence" | "array" | "document";
 export type Trace3 =
   | (
       | number
@@ -1930,6 +1944,10 @@ export type Fallback12 =
 export type Role12 = string | null;
 export type HasError12 = boolean;
 export type Kind12 = "data";
+/**
+ * Do not evaluate expressions inside strings.
+ */
+export type Raw = boolean;
 /**
  * Name of the variable used to store the result of the execution of the block.
  *
@@ -3878,6 +3896,7 @@ export interface DataBlock {
   has_error?: HasError12;
   kind?: Kind12;
   data: Data;
+  raw?: Raw;
 }
 /**
  * Type specification of the result of the block.
@@ -4044,11 +4063,7 @@ export interface RepeatBlock {
   kind?: Kind10;
   repeat: Repeat2;
   num_iterations: NumIterations;
-  /**
-   * Define how to combine the result of each iteration.
-   *
-   */
-  as?: IterationType & string;
+  as?: IterationType2;
   trace?: Trace3;
 }
 /**
@@ -4132,11 +4147,7 @@ export interface RepeatUntilBlock {
   kind?: Kind9;
   repeat: Repeat1;
   until: Until;
-  /**
-   * Define how to combine the result of each iteration.
-   *
-   */
-  as?: IterationType & string;
+  as?: IterationType1;
   trace?: Trace2;
 }
 /**
@@ -4220,11 +4231,7 @@ export interface ForBlock {
   kind?: Kind8;
   for: For;
   repeat: Repeat;
-  /**
-   * Define how to combine the result of each iteration.
-   *
-   */
-  as?: IterationType & string;
+  as?: IterationType;
   trace?: Trace1;
 }
 /**
diff --git a/pdl-schema.json b/pdl-schema.json
index 5e4b9dac..c1407984 100644
--- a/pdl-schema.json
+++ b/pdl-schema.json
@@ -3835,6 +3835,12 @@
         "data": {
           "description": "Value defined.",
           "title": "Data"
+        },
+        "raw": {
+          "default": false,
+          "description": "Do not evaluate expressions inside strings.",
+          "title": "Raw",
+          "type": "boolean"
         }
       },
       "required": [
diff --git a/pdl/pdl.py b/pdl/pdl.py
index d1f15379..02f226b9 100644
--- a/pdl/pdl.py
+++ b/pdl/pdl.py
@@ -60,7 +60,7 @@ def exec_program(
     state = InterpreterState(**config)
     scope = scope or {}
     loc = loc or empty_block_location
-    result = process_prog(state, scope, prog, loc)
+    result, _, _, _ = process_prog(state, scope, prog, loc)
     return result
 
 
diff --git a/pdl/pdl_ast.py b/pdl/pdl_ast.py
index 12d0245c..154302e1 100644
--- a/pdl/pdl_ast.py
+++ b/pdl/pdl_ast.py
@@ -316,6 +316,8 @@ class DataBlock(Block):
     kind: Literal[BlockKind.DATA] = BlockKind.DATA
     data: ExpressionType
     """Value defined."""
+    raw: bool = False
+    """Do not evaluate expressions inside strings."""
 
 
 class DocumentBlock(Block):
diff --git a/pdl/pdl_dumper.py b/pdl/pdl_dumper.py
index 8b0b1216..4c6f5678 100644
--- a/pdl/pdl_dumper.py
+++ b/pdl/pdl_dumper.py
@@ -112,6 +112,8 @@ def block_to_dict(block: pdl_ast.BlockType) -> int | float | str | dict[str, Any
             d["get"] = block.get
         case DataBlock():
             d["data"] = block.data
+            if block.raw:
+                d["raw"] = block.raw
         case ApiBlock():
             d["api"] = block.api
             d["url"] = block.url
diff --git a/pdl/pdl_interpreter.py b/pdl/pdl_interpreter.py
index 1ad10954..11828184 100644
--- a/pdl/pdl_interpreter.py
+++ b/pdl/pdl_interpreter.py
@@ -315,16 +315,21 @@ def step_block_body(
                 yield YieldBackgroundMessage(background)
         case DataBlock(data=v):
             block.location = append(loc, "data")
-            result, errors = process_expr(scope, v, append(loc, "data"))
-            if len(errors) != 0:
-                result = None
-                background = []
-                trace = handle_error(
-                    block, append(loc, "data"), None, errors, block.model_copy()
-                )
-            else:
+            if block.raw:
+                result = v
                 background = [{"role": state.role, "content": stringify(result)}]
                 trace = block.model_copy()
+            else:
+                result, errors = process_expr(scope, v, append(loc, "data"))
+                if len(errors) != 0:
+                    result = None
+                    background = []
+                    trace = handle_error(
+                        block, append(loc, "data"), None, errors, block.model_copy()
+                    )
+                else:
+                    background = [{"role": state.role, "content": stringify(result)}]
+                    trace = block.model_copy()
             if state.yield_result:
                 yield YieldResultMessage(result)
             if state.yield_background:
diff --git a/tests/test_data.py b/tests/test_data.py
new file mode 100644
index 00000000..e20611af
--- /dev/null
+++ b/tests/test_data.py
@@ -0,0 +1,64 @@
+from pdl.pdl import exec_str
+
+
+def test_int():
+    prog_str = """
+data: 1
+"""
+    result = exec_str(prog_str)
+    assert result == 1
+
+
+def test_array():
+    prog_str = """
+data:
+  - 1
+  - 2
+  - 3
+  - bye
+"""
+    result = exec_str(prog_str)
+    assert result == [1, 2, 3, "bye"]
+
+
+def test_object():
+    prog_str = """
+data:
+  document: Hello
+  model:
+    - a
+    - b
+"""
+    result = exec_str(prog_str)
+    assert result == {"document": "Hello", "model": ["a", "b"]}
+
+
+def test_expr():
+    prog_str = """
+defs:
+  x: a
+  y: b
+data:
+  document: Hello
+  model:
+    - "{{ x }}"
+    - "{{ y }}"
+"""
+    result = exec_str(prog_str)
+    assert result == {"document": "Hello", "model": ["a", "b"]}
+
+
+def test_raw():
+    prog_str = """
+defs:
+  x: a
+  y: b
+data:
+  document: Hello
+  model:
+    - "{{ x }}"
+    - "{{ y }}"
+raw: true
+"""
+    result = exec_str(prog_str)
+    assert result == {"document": "Hello", "model": ["{{ x }}", "{{ y }}"]}