Issues with Chat on the mobile App

General question. I play Diablo 4 on console so I use the battlenet app to chat. If I receive a whisper from someone I have friended, it comes as a notification on my phone but I can also continue the conversation in the Chat window in the app. However, if the person whispering to me isn’t on my friend list I can only reply via the notification pop-up window. They don’t get added to my Chats window where I could reply to them later. So once I clear that notification, its gone forever.

I would like any whisper I receive to go to my Chats window in the battlenet app, regardless of Friend status but that doesn’t seem possible?