How can I return a “web treatment” if the “Action Flow” choreographies multiple treatments within?

There is a Sample Flow in the user guide where the engagement with the customer is done in multiple channels:

There is a component for inbound channels, assisted channels only, but there is no such component for web.

Note: If an activity uses the default flow, it has web and assisted channel treatments, the specific treatment is returned as requested in the NBA Container request by setting the channel property, in this scenario there is no treatment choreography.