If you want to make it fancier and potentially easier. You can make callous motion graphics in the fusion shape system and than use extrude 3D so you get free 3D objects for free. If you have tracked with camera tracker your scene and you have point cloud than you can use it to just place the call outs now as 3D objects in locations you want. 3D will reflect animation of the shape system. So you animate in 2D and get 3D for free which are easy to place in the scene and look more suitable for such a scene than simple 2D callous.
You than get proper 3D shadow and reflections and extrusion and anything you like while you get the best of both 2D call out animation and 3D look and placement in 3D scene. And if you wanted to you can always link the transform controls of callous graphics to be facing camera so they are always easy to read. And if you every want them to look flat you simply turn off lighting in the screen and reduce extrusion., And if you want them to look 3D you just turn it back on.
As an example, here is Fusion logo imported into fusion as SVG graphics with paths. Converted to shape system using this little handy script. You could use that script to covert your polygon or Bspline shapes to shape sytem and extrude them in 3D.
shapeConverter - Convert Polygons and Text+ from SVG into Shape nodes
https://www.steakunderwater.com/wesuckl ... php?t=6599...and than with extrude 3D and sOutline I can animate outline animation and have it in 3D.

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Or ordinary sText.

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The great thing about fusion shape system is that they added that extrude3D tool which convert them to 3D models and you can use that to get all sorts of custom 3D shapes we would not other be able to make in fusion. And you still get to aniamte and make shapes in 2D.
Obviously you will need to track your scene with camera tracker 3D and solve and export a 3D scene and than its about populating it with your calls outs now in both 2D and 3D. I think that is how I would do it. You can watch various tutorials on 3D camera tracking in fusion and shape to 3D using extrude 3D tool should be pretty straightforward.