We had a discussion in matrix (kicked off by @fizzo) if we could make telegram-desktop's notification adhere to #phosh's full/quiet/silent profile. Turns out (https://github.com/telegramdesktop/tdesktop/issues/28895) that the app detects the notifications servers sound capability already so with https://gitlab.gnome.org/World/Phosh/phosh/-/merge_requests/1618 and the corresponding #feedbackd MR this should work.
As I'm not a #telegram user, testing feedback would be welcome.