diff --git a/homeassistant/components/tts/__init__.py b/homeassistant/components/tts/__init__.py
index 88504e7953d..64efc308dcf 100644
--- a/homeassistant/components/tts/__init__.py
+++ b/homeassistant/components/tts/__init__.py
@@ -715,6 +715,7 @@ def get_base_url(hass: HomeAssistant) -> str:
 @websocket_api.websocket_command(
     {
         "type": "tts/engine/list",
+        vol.Optional("country"): str,
         vol.Optional("language"): str,
     }
 )
@@ -725,13 +726,17 @@ def websocket_list_engines(
     """List text to speech engines and, optionally, if they support a given language."""
     manager: SpeechManager = hass.data[DOMAIN]
 
+    country = msg.get("country")
     language = msg.get("language")
     providers = []
     for engine_id, provider in manager.providers.items():
-        provider_info: dict[str, Any] = {"engine_id": engine_id}
+        provider_info: dict[str, Any] = {
+            "engine_id": engine_id,
+            "supported_languages": provider.supported_languages,
+        }
         if language:
-            provider_info["language_supported"] = bool(
-                language_util.matches(language, provider.supported_languages)
+            provider_info["supported_languages"] = language_util.matches(
+                language, provider.supported_languages, country
             )
         providers.append(provider_info)
 
diff --git a/tests/components/tts/common.py b/tests/components/tts/common.py
index 6e77c89177e..cd0840947c9 100644
--- a/tests/components/tts/common.py
+++ b/tests/components/tts/common.py
@@ -16,7 +16,7 @@ from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 from tests.common import MockPlatform
 
-SUPPORT_LANGUAGES = ["de_DE", "en_GB", "en_US"]
+SUPPORT_LANGUAGES = ["de_CH", "de_DE", "en_GB", "en_US"]
 TEST_LANGUAGES = ["de", "en"]
 
 DEFAULT_LANG = "en_US"
diff --git a/tests/components/tts/test_init.py b/tests/components/tts/test_init.py
index 9ab71f2512f..1ac6a053440 100644
--- a/tests/components/tts/test_init.py
+++ b/tests/components/tts/test_init.py
@@ -1041,14 +1041,21 @@ async def test_ws_list_engines(
 
     msg = await client.receive_json()
     assert msg["success"]
-    assert msg["result"] == {"providers": [{"engine_id": "test"}]}
+    assert msg["result"] == {
+        "providers": [
+            {
+                "engine_id": "test",
+                "supported_languages": ["de_CH", "de_DE", "en_GB", "en_US"],
+            }
+        ]
+    }
 
     await client.send_json_auto_id({"type": "tts/engine/list", "language": "smurfish"})
 
     msg = await client.receive_json()
     assert msg["success"]
     assert msg["result"] == {
-        "providers": [{"engine_id": "test", "language_supported": False}]
+        "providers": [{"engine_id": "test", "supported_languages": []}]
     }
 
     await client.send_json_auto_id({"type": "tts/engine/list", "language": "en"})
@@ -1056,7 +1063,7 @@ async def test_ws_list_engines(
     msg = await client.receive_json()
     assert msg["success"]
     assert msg["result"] == {
-        "providers": [{"engine_id": "test", "language_supported": True}]
+        "providers": [{"engine_id": "test", "supported_languages": ["en_US", "en_GB"]}]
     }
 
     await client.send_json_auto_id({"type": "tts/engine/list", "language": "en-UK"})
@@ -1064,7 +1071,25 @@ async def test_ws_list_engines(
     msg = await client.receive_json()
     assert msg["success"]
     assert msg["result"] == {
-        "providers": [{"engine_id": "test", "language_supported": True}]
+        "providers": [{"engine_id": "test", "supported_languages": ["en_GB", "en_US"]}]
+    }
+
+    await client.send_json_auto_id({"type": "tts/engine/list", "language": "de"})
+    msg = await client.receive_json()
+    assert msg["type"] == "result"
+    assert msg["success"]
+    assert msg["result"] == {
+        "providers": [{"engine_id": "test", "supported_languages": ["de_DE", "de_CH"]}]
+    }
+
+    await client.send_json_auto_id(
+        {"type": "tts/engine/list", "language": "de", "country": "ch"}
+    )
+    msg = await client.receive_json()
+    assert msg["type"] == "result"
+    assert msg["success"]
+    assert msg["result"] == {
+        "providers": [{"engine_id": "test", "supported_languages": ["de_CH", "de_DE"]}]
     }