[Feature Request] Custom Vibration for Notifications

Problem
iOS has the feature of creating custom vibration patterns that can be assigned to notifications.
In iOS 13 it is possible to create them in Settings -> Sounds: Sounds and Vibration Patterns -> Text Tone (any would work) -> Vibration: Custom -> Create New Vibration.
They can then be assigned to built-in apps via Settings -> Sounds.

However it looks like setting custom vibration patterns to third-party app notifications is only possible via the in-app settings. Currently Telegram does not have the option to set a vibration pattern for notifications, but just a sound.

Scenario
My personal use case scenario is actually pretty simple: the default vibration pattern for notification is way too long and annoying when receiving many notifications in a short amount of time and I would like to change it with a much shorter vibration (indeed now I am forced to disable sounds, while a much shorter one would be ok - I tested it on Messages app).

Generally speaking I think it could be useful to distinguish a notification when the phone in silent mode without looking.

New Feature Request
Add an option in Telegram settings to set a vibration pattern for notifications (among the default ones and the ones created via the iOS functionality).

The issue names no files, tests, or entry points. Start by locating Telegram’s iOS notification settings and notification delivery implementation, then verify which vibration patterns iOS exposes; done means users can select a custom notification vibration, including patterns created in iOS Settings.