If it's at all feasible, my recommendation would be to use the editor in SwordSearcher to insert the images. You could use Forge to do the initial import of the text, make sure the module is built to be editable, and then add the images in the module entry editor in SwordSearcher to ensure they are properly inserted.
It should be possible to do it with Forge, but I will need to look into getting the exact format for you -- if you have a lot of images to do and you are automating this somehow, that would make sense. Let me know if you decide you need to do it with Forge and I will look into it.