No. The icons are integrated directly into the firmware of the bracelet and no third party application can add them.
Only Xiaomi can add them into the firmware and if they do, we'll always update our application to give you all the great features like multi-icon swapping. Please do not down-rate us or ask us to add icons for Viber, Telegram, etc. It's truly not technically possible.
We already give you option to chose from all the icons available inside of the firmware (see below) and we also offer you multi-icon swapping feature that helps you to easily distinguish source and type of the vibrations.
Icons available in latest firmware: