The ability to highlight important or featured users on a per-account basis, so users could choose other profiles on Telegram to bypass Do Not Disturb on Android or Focus Modes on iOS. This will apply to calls and messages that are incoming to the account. On iOS this could be implemented with a feature called "Time Sensitive Notifications" at a cost of notifications being partially non-dismissible until they are read through Telegram application. To prevent abuse, this either cannot be chosen for channels or groups, or have a limited amount of featured users, or require authorisation from the invited user to become important contacts on both ends. Additionally, this can allow making either only calls, messages or both "important" individually using a setting.
I was thinking same thing, though this level of control doesn’t exist in iOS and some Android ROMs, especially older ones. This suggestion is mostly to integrate this to the app itself for the ease of use of the end user.