I have not been using Litchi very long, but I do not believe you can specifically tell the UAS to orbit a specific POI once it arrives.
I have wanted to do the same, but I have just added additional waypoints, and made sure to adjust the speed, curve size, interpolation, and gimbal angle during the sweep around the object. It is a bit of work, but I've had some great results.
One way to "test" this is using Litchi Virtual Mission and Google Earth Pro. You can virtually fly the mission and really get a great idea of what you'll end up with. This is what I am using to plan all my flights for the trip to Florida next month. Side note: the FAA does not want pilots to fly beyond a line of sight of the operator, and quite often, my missions send the UAS to where I cannot see it. Using Litchi Virtual Mission and Google Earth Pro, I check heights of buildings, trees, and other objects, and then make adjustments to the waypoints in the mission and fly it virtually again until I am happy. I figure that it's better to be safe than sorry. I do not want to damage anyone else's property and do not want to lose my drone. I can also say that each time I send her off on a mission, I pace back and forth until she arrives back, because sometimes I lose visual signal and have even lost signal between the controller and drone. When I hear the props buzzing again, I usually run inside and throw on a clean pair of boxers while she lands herself. I trust Litchi more and more each time I use it, but my point is that you need to program, verify, test, adjust, test, adjust, re-verify all of the settings before flight. It's just good practice.
Search "Litchi Virtual Mission" in this forum- there's a download link. I'm very happy with Litchi so far and wish DJI would offer this for the Mavic Air.