The closest thing in STM is in the stage example scene - look for the script named "STMEventInterpreter" and it has a custom event within it that can spawn a "link" prefab overtop of letters. Since its a prefab, it can be modified to be any collider type, and do anything you want when clicked! The default prefab just uses OnMouseDown() to send a debug message, and uses the script "STMSampleLink"
I hope this helps!