In the rich text editor:
@Lark
In a comment:
[Lark](https://chowlings.com/user/Lark)
For Names and Avatars:
In the rich text editor:
%Lark
In a comment:
[![Lark's Avatar](https://chowlings.com/images/avatars/1037.png?v=1644063245)](https://chowlings.com/user/Lark) [Lark](https://chowlings.com/user/Lark)