Use | to_json

roles/matrix-bridge-mautrix-telegram/templates/config.yaml.j2

@@ -273,12 +273,12 @@ bridge:
         # Filter mode to use. Either "blacklist" or "whitelist".
         # If the mode is "blacklist", the listed chats will never be bridged.
         # If the mode is "whitelist", only the listed chats can be bridged.
-        mode: "{{ matrix_mautrix_telegram_filter_mode }}"
+        mode: {{ matrix_mautrix_telegram_filter_mode | to_json }}
         # The list of group/channel IDs to filter.
         list: []
 
     # The prefix for commands. Only required in non-management rooms.
-    command_prefix: "{{ matrix_mautrix_telegram_command_prefix }}"
+    command_prefix: {{ matrix_mautrix_telegram_command_prefix | to_json }}
 
     # Permissions for using the bridge.
     # Permitted values: