I think web.webInteraction.name would be equivalent to s.ActivityMap.link and web.webInteraction.region would be equivalent to s.ActivityMap.regionID.
If I enabled Activity Map in WebSDK, I see the following in my payload for activity map:
Likewise, you can see the same web.webInteraction, so I think we can customize the above two to achieve the same behaviour.
But yes there isn't any document available for this. Not sure if someone has already tested this.