Proton messenger
Probably I'm too obvious but I do not understand why don't you work (or maybe u do) on Proton Messenger. War in my country has shown that you need a secure message exchange system. The best messenger on the market is Telegram. It is really the best one, no one is even close from all of the points of view except security, because they do nothing to prove they don't work with the Russian government. And basically, there is indirect evidence that they have some collaboration with FSB.
I trust Signal but it is a disaster from a UX perspective. Same as Watsup, Viber..... etc.
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Anonymous commented
This is already a planned idea. Please support this thread so all votes/comments are compiled. https://protonmail.uservoice.com/forums/945460-general-ideas/suggestions/7255107-proton-chat-messaging-app