Closes #19377: Introduce config context profiles (#20058)

docs/models/extras/configcontext.md

@@ -14,6 +14,10 @@ A unique human-friendly name.
 
 A numeric value which influences the order in which context data is merged. Contexts with a lower weight are merged before those with a higher weight.
 
+### Profile
+
+The [profile](./configcontextprofile.md) to which the config context is assigned (optional). Profiles can be used to enforce structure in their data.
+
 ### Data
 
 The context data expressed in JSON format.

docs/models/extras/configcontextprofile.md

@@ -0,0 +1,33 @@
+# Config Context Profiles
+
+Profiles can be used to organize [configuration contexts](./configcontext.md) and to enforce a desired structure for their data. The later is achieved by defining a [JSON schema](https://json-schema.org/) to which all config context with this profile assigned must comply.
+
+For example, the following schema defines two keys, `size` and `priority`, of which the former is required:
+
+```json
+{
+    "properties": {
+        "size": {
+            "type": "integer"
+        },
+        "priority": {
+            "type": "string",
+            "enum": ["high", "medium", "low"],
+            "default": "medium"
+        }
+    },
+    "required": [
+        "size"
+    ]
+}
+```
+
+## Fields
+
+### Name
+
+A unique human-friendly name.
+
+### Schema
+
+The JSON schema to be enforced for all assigned config contexts (optional).