Cursor position is not passed to any plugin. So the only possibilities is for any plugin to do this would be:
1. The Plugin will add image file to epub and copy the required svg and any xhtml pieces needed to your clipboard, so that the user can just paste it once the plugin returns.
or
2. The user adds a unique placeholder to tell the plugin where you want the svg to be inserted. Something like:
Code:
<!-- PLUGIN INSERT SVG HERE -->
You could create a clip to insert that easily anyplace you want
Then the plugin would have to be modified to look for that placeholder and replace it with the required svg.
Either of these approaches could work to accomplish what you want but this up to the plugin dev if to implement if they want.