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. 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.
Since version 2.4.0, we do also offer you a numeric vibration feature and you can use it to set your own custom notification numbers and have literally thousands of different combinations to choose from! Learn more about these features.
Icons available since firmware V184.108.40.206:
Icons available since firmware V220.127.116.11:
Icons available since firmware V18.104.22.168:
Icon swap feature allows you to easily swap between multiple icons: