New method from Bot API 4.5

- setChatAdministratorCustomTitle

aiogram/bot/api.py

@@ -188,6 +188,7 @@ class Methods(Helper):
     UNBAN_CHAT_MEMBER = Item()  # unbanChatMember
     RESTRICT_CHAT_MEMBER = Item()  # restrictChatMember
     PROMOTE_CHAT_MEMBER = Item()  # promoteChatMember
+    SET_CHAT_ADMINISTRATOR_CUSTOM_TITLE = Item()  # setChatAdministratorCustomTitle
     SET_CHAT_PERMISSIONS = Item()  # setChatPermissions
     EXPORT_CHAT_INVITE_LINK = Item()  # exportChatInviteLink
     SET_CHAT_PHOTO = Item()  # setChatPhoto

aiogram/bot/bot.py

@@ -1118,6 +1118,22 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
 
         result = await self.request(api.Methods.PROMOTE_CHAT_MEMBER, payload)
         return result
+    
+    async def set_chat_administrator_custom_title(self, chat_id: typing.Union[base.Integer, base.String], user_id: base.Integer, custom_title: base.String) -> base.Boolean:
+        """
+        Use this method to set a custom title for an administrator in a supergroup promoted by the bot.
+
+        Returns True on success.
+
+        :param chat_id: Unique identifier for the target chat or username of the target supergroup
+        :param user_id: Unique identifier of the target user
+        :param custom_title: New custom title for the administrator; 0-16 characters, emoji are not allowed
+        :return: True on success.
+        """
+        payload = generate_payload(**locals())
+
+        result = await self.request(api.Methods.SET_CHAT_ADMINISTRATOR_CUSTOM_TITLE, payload)
+        return result
 
     async def set_chat_permissions(self, chat_id: typing.Union[base.Integer, base.String],
                                    permissions: types.ChatPermissions) -> base.Boolean: