A sequence diagram is a specific UML viewpoint and is not supported directly by Archi. But you can easily describe this Application Interaction (that's the best equivalent in ArchiMate) by using Triggers and Flow relationships between Application Component. If you want to reproduce a sequence diagram as much as possible, you'll then have to define the dimensions of Application Components to make them thin but tall.
PS: another option (but without any link to the model you are designing) is to use a Canvas and define the HTML code of the hint in such a way that it will call e.g. websequencediagrams.com. You'll then be able to see he generated sequences in the Hint window.