https://www.npmjs.com/package/angular-mentions Demo code: [angular-mention-demo ](https://github.com/GetStream/stream-chat-angular/tree/angular-mention-demo) Relevant parts: - [config in TS](https://github.com/GetStream/stream-chat-angular/blob/6256a04b75492fafbea0637a6c83c721ee7b479a/projects/stream-chat-angular/src/lib/message-input/message-input.component.ts#L228) - [list item templates](https://github.com/GetStream/stream-chat-angular/blob/6256a04b75492fafbea0637a6c83c721ee7b479a/projects/stream-chat-angular/src/lib/message-input/message-input.component.html#L17)
